Best Slots Bonuses in the UK for September 2023

Last Updated: 25/09/2023

Verified by Lee James Gwilliam

Meet the expert

We rate and review every online slots bonus we can find, so you can get the best slots bonus in the UK. Find out how to claim a slots sign up bonus and use our wagering calculator to compare slot welcome offers. 

Check out our list below of the best UK casinos with a slots deposit bonus: 

Affiliate disclosure: At Casinos.com, we want to ensure that players are matched with the right casino and sportsbook offers for them. For this reason, some of the recommended site links are affiliate links. This means that if you visit a website through our link and make a deposit, Casinos.com will receive a commission payment at no extra cost to you.
  1. Flame Icon In High Demand!
    Users signed up and got bonus from this casino in the last 3 months
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    BetVictor Bonus Wager £10 Get £50 in Slot Bonuses
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    Casino Games 1245 Slots 1519 Live Games 35 Minimum Deposit to Qualify £10.00 Payment providers MasterCard VISA Bank Transfer Apple Pay Wager Requirement 40x Maximum Bonus £50.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Opt in, deposit and wager £10 on selected games within 7 days of opening new account. Get 5 x £10 bonus for selected games with up to 40x wagering & 7 days expiry. Max redeemable from bonuses £1,250. Card payments only.
  2. 2
    Mr Vegas Bonus 100% Welcome Bonus Up To £200 + 11 Wager Free Bonus Spins
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    Casino Games 3610 Slots 3121 Live Games 254 Minimum Deposit to Qualify £10.00 Payment providers VISA MasterCard PayPal Trustly Wager Requirement 35x Maximum Bonus £200.00 % Match 100%
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. The Welcome Bonus is only available to newly registered players who make a minimum initial deposit of € 10.
  3. 3
    Kwiff Bonus Get up to 200 Bonus Spins
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    Casino Games 400 Slots 487 Live Games 36 Minimum Deposit to Qualify £20.00 Payment providers MasterCard VISA PayPal Payz Wager Requirement 10x Value per Bonus Spin £0.10 Expiry Date on Bonus December 31st, 2023
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Wager £/€20 on slots and Get 40 Cash Extra Spins for five consecutive days.* £/€20 stake on slots each day within 5 days of 1st deposit to qualify. £0.1 Spins on Book of Dead. £/€250 total max withdrawal.
  4. 4
    Casimba Bonus 100% Welcome Bonus up to £200 + 50 Bonus Spins
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    Casino Games 1354 Slots 1386 Live Games 19 Minimum Deposit to Qualify £20.00 Payment providers Trustly Paysafecard NETELLER Skrill Wager Requirement 35x Maximum Bonus £200.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £200 plus 50 bonus spins on your 1st deposit, 50% match up to £50 on your 2nd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Affordability checks apply.
  5. 5
    SpinYoo Bonus 100% Welcome Bonus up to £250 + 100 Bonus Spins
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    Casino Games 1750 Slots 1675 Live Games 31 Minimum Deposit to Qualify £10.00 Payment providers VISA Trustly MasterCard Maestro Wager Requirement 35x Maximum Bonus £250.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min Dep £20. Max Bonus Bet £5. Offer: 100% of 1st deposit up to £250 + 100 Yoo Spins on Starburst, Book of Dead, Fire Joker, Gonzo's Quest, & Big Bass Bonanza respectively (first 20 credited on 1st deposit; rest credited at 07:00GMT at 20/day). Spins expire after 23:59GMT on day they’re credited. Winnings from each 20 spins capped at £50 & credited as bonus. Bonus funds expire after 30 days, are separate to Cash funds, & subject to 35x wagering of bonus + deposit amounts. Only bonus funds contribute to wagering requirements. Bonus funds can only be used on slots. Full Terms Apply.
  6. 6
    All British Bonus 100% Welcome Bonus up to £100 + 10% Cashback
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    Casino Games 1293 Slots 1176 Live Games 44 Minimum Deposit to Qualify £20.00 Payment providers Paysafecard NETELLER Skrill MasterCard Wager Requirement 35x % Cashback 10% % Match 100%
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Welcome bonus for new players only | Maximum bonus is 100% up to £100 | Min. deposit is £20 | No max cash out | Wagering is 35x bonus | Maximum bet with an active bonus is £5 | Eligibility is restricted for suspected abuse | Cashback is cash with no restrictions | Skrill & Neteller deposits excluded | Cashback applies to deposits where no bonus is included.
  7. 7
    Regal Wins Bonus 100% Welcome Bonus up to £300 + 50 Bonus Spins
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    Casino Games 1142 Slots 1094 Live Games 27 Minimum Deposit to Qualify £20.00 Payment providers Paysafecard PayPal Visa Electron VISA Wager Requirement 50x Maximum Bonus £300.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. 1st dep. of £20-£300, max bonus £300 on selected slots; 50x wagering on the sum of deposit & bonus applies. Max convertible 5x bonus amount received. Extra Spins: Use code: REGAL when depositing in the cashier. 5 Batches of 10 FS Daily. Winnings capped at £10 per batch. Full T&C apply.
  8. 8
    MagicRed Bonus 100% Welcome Bonus up to £50 + 110 Bonus Spins
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    Casino Games 1388 Slots 1263 Live Games 148 Minimum Deposit to Qualify £20.00 Payment providers MasterCard Zimpler Trustly Paysafecard Wager Requirement 50x Maximum Bonus £50.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. 18+. New Players Only. Welcome Package split over 3 deposit. Min 1st Deposit: £20. Min 2nd and 3rd Deposit: £20. Wagering Requirement: 50x. Spins are credited in specific games. Spins expire after 24 hours. Promotion available for 72 hours. Maximum winnings from spins: £100. Terms and Conditions apply.
  9. 9
    Dream Vegas Bonus 100% Welcome Bonus up to £300 + 150 Bonus Spins
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    Casino Games 3010 Slots 1421 Live Games 19 Minimum Deposit to Qualify £20.00 Payment providers Entropay NETELLER Paysafecard Skrill Wager Requirement 35x Maximum Bonus £300.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. One offer per player. Max bonus bet £5. Offer: 100% bonus match on 1st deposit + bonus spins. Value of bonus & number of spins depend on deposit amount: £20-£100: max £100 bonus + 50 spins on selected games; £101-£200: max £200 bonus + 100 spins on selected games; or £200+: max £300 bonus + 150 spins on eligible NetEnt Games. Winnings from spins credited as bonus and capped at £100. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute to wagering requirement. Bonus funds expire within 30 days; bonus spins within 72hrs. Affordability checks apply. Full Terms Apply
  10. 10
    Party Bonus 100% Welcome Bonus up to £250
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    Casino Games 1535 Slots 1445 Live Games 74 Minimum Deposit to Qualify £10.00 Payment providers Paysafecard PayPal Skrill NETELLER Wager Requirement 35x Maximum Bonus £250.00 % Match 100%
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. UK players only. New customers only. Minimal initial deposit £10. Once the offer is claimed players have 30 days to release equivalent to initial deposit as a cash reward up to £250. 35x wagering requirement before cash rewards applied. Certain deposit options are excluded.
  11. 11
    Lucky VIP Bonus Welcome bonus up to £100 + up to £7 on Live Casino
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    Casino Games 1072 Slots 1017 Live Games 28 Minimum Deposit to Qualify £20.00 Payment providers PayPal MasterCard VISA Paysafecard Wager Requirement 20x Maximum Bonus £100.00 % Match 100%
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Minimum 1st dep of £20 to get 100% up to £100 on selected match slots; 40x wagering requirement (Dep + Bonus) & MCR x5 for Bonus + Guaranteed Live bonus wheel up to £7. Live Bonus and Live Bonus Winnings are playable on selected Live Games. 20x WR, convertible to real cash x5 bonus amount. 18+ only. Full T&C's apply
  12. 12
    Duelz Bonus 100% Welcome Bonus up to £100 + 100 Bonus Spins
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    Casino Games 661 Slots 612 Live Games 16 Minimum Deposit to Qualify £20.00 Payment providers VISA MasterCard Skrill NETELLER Wager Requirement 30x Maximum Bonus £100.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min deposit: £20. Max £100 bonus. Max bet with active bonus: £2. Wagering required 100% match bonus: 30x deposit + bonus. Max win from welcome bonus: £500. 100 Extra Spins are given out 20 per day on Book of Dead for 5 days in a row. Max Extra Spins winnings: £100. Extra Spins winnings credited as bonus money with 45x wagering & 3 days expiry. Deposit bonus & Extra Spins wins are forfeited 30 days after bonus is credited if the wagering is not met. Game weighting and restrictions apply.
  13. 13
    Queen Vegas Bonus 100% Welcome Bonus up to 25 Bonus Spins
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    Casino Games 2125 Slots 3552 Live Games 89 Minimum Deposit to Qualify £10.00 Payment providers VISA MasterCard Bank Transfer Paysafecard Wager Requirement 60x Value per Bonus Spin £1.00 Expiry Date on Bonus March 14th, 2025
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Game: Spina Colada, Spin Value: £1, Max Mega Spins: 25. WR 60x extra spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the extra spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.
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    Spin and Win Bonus 100% Welcome Bonus up to £500 + £7 Add On
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    Casino Games 1050 Slots 950 Live Games 42 Minimum Deposit to Qualify £10.00 Payment providers Paysafecard Visa Electron VISA MasterCard Wager Requirement 40x Maximum Bonus £500.00 % Match 100%
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. 1st dep only (min £10), max bonus £500, valid 7 days, on selected slots; 40x wagering on the sum of deposit & bonus applies. Max convertible to real is 5x bonus amount received bonus & wins for selected slots only, Full T&C apply.
  15. 15
    HeySpin Bonus 100% up to £50 + 100 Bonus Spins
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    Casino Games 1382 Slots 1171 Live Games 132 Minimum Deposit to Qualify £20.00 Payment providers VISA Skrill Payz PayPal Wager Requirement 35x Maximum Bonus £50.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min. deposit £20. Max bonus allowed is £50. Offer duration upon receiving is valid for 2 weeks (14 days). Max Win from spins is £100. 35x wagering applies both for bonus and spins part. Spins are credited on specific games(Starburst). Spins expire after 24 hours if unused. Full T&Cs Apply.
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    Pink Casino Bonus 100% Welcome Bonus up to £150 + 50 Bonus Spins on Big Bass Splash
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    Casino Games 364 Slots 310 Live Games 49 Minimum Deposit to Qualify £10.00 Payment providers VISA MasterCard PayPal Wager Requirement 35x Maximum Bonus £150.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. 7 days to claim offer and deposit a min of £10 with a further 7 days to wager 35x. Cash stakes only and wagering contributions vary. Max reward £150. 50 wager-extra spins 0.10p each on Big Bass Splash awarded after wagering complete, winnings paid as cash. 3 day expiry.
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    666 Casino Bonus Welcome Bonus up to £66 + 66 Bonus Spins
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    Casino Games 1880 Slots 1775 Live Games 255 Minimum Deposit to Qualify £20.00 Payment providers VISA MasterCard PayPal Trustly Wager Requirement 35x Maximum Bonus £66.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min deposit £20. Max bonus 100% up to £66 on 1st deposit. 66 spins on Big Bass Bonanza on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours.
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    Fun Casino Bonus 100% Welcome Bonus up to £123 + 200 Bonus Spins on Hot Fruits 27
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    Casino Games 1303 Slots 1253 Live Games 44 Minimum Deposit to Qualify £10.00 Payment providers MuchBetter Paysafecard NETELLER Skrill Wager Requirement 50x Maximum Bonus £123.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Maximum bonus is £123. Max bet with bonus is £5. No max cash out. Wagering is 50x. Skrill & Neteller excluded. Eligibility is restricted for suspected abuse.
  19. 19
    Atlantic Spins Bonus Welcome Bonus up to £400 & 125 Spins
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    Casino Games 27 Slots 2500 Live Games 1 Minimum Deposit to Qualify £20.00 Payment providers Skrill VISA MasterCard PayPal Wager Requirement 35x Maximum Bonus £400.00 Value per Free Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. New players only 18+. Min deposit: £20. Max offer: 100% Bonus up to £400 & 125 Spins (on game of our choice). Bonus and Spins split over 3 deposits (min £20 dep required for each). 1st deposit 100% up to £100 + 45 Spins, 2nd deposit 50% up to £150 + 40 Spins, 3rd Deposit 50% Up to £150 + 40 Spins. Bonus & Spins winnings must be wagered 35x before withdrawal. Spins expire after 5 days. Withdrawal & full T&Cs apply. Valid until 31/12/2023. www.begambleaware.org.
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    Electric Spins Bonus 200% Welcome Bonus up to £20 + 100 Bonus Spins
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    Casino Games 650 Slots 650 Live Games icon-no Minimum Deposit to Qualify £10.00 Payment providers VISA MasterCard Bank Transfer PayPal Wager Requirement 40x Maximum Bonus £20.00 Value per Bonus Spin £0.10
    #ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min deposit: £10. Max offer: £20 Games Bonus & 100 Extra Spins (on a game of our choice). Promo code: SPINIT. Any Games Bonus winnings, if applicable, must be wagered 60x before withdrawal. Any Extra Spins winnings, if applicable, will be credited as bonus funds and capped at £10. FS are valid for 7 days and any winnings must be wagered 40x before withdrawal. Games Bonus win cap: £100 + original bonus amount. Wagering contribution varies by game. We reserve the right to deny bonuses based on abusive bonus activity across sites operated by the Company. Deposit balance is available for withdrawal at any time (UK only). General withdrawal restrictions apply. Valid until 31.12.2023.

Guide to Finding the Best Slot Bonuses in 2023

Slots are the most played games at casino sites, so it's no surprise many operators try to attract you with an online casino bonus on slots.

There's one obvious reason why slots are so popular. If you're lucky, you can win big jackpots from modest stakes. For instance, a UK player won £16 million from just 25p! This kind of jackpot size and win is rare though — there's perhaps a one in 34 million chance of winning a £16 million slot jackpot. 

Another big attraction to slots is bonuses. You can get a 100% match bonus to sign up at a casino, and existing players can also grab a slots deposit bonus.

We aim to bring you all the top slots bonuses from the best and newest slot sites and games all year round. The market is constantly changing, so instead of testing hundreds of casinos yourself, we do that for you.

Finding the Deals: Online Slots Bonus Offers

When seeking the best offers, most of our time is spent within the T&Cs of slots bonuses. It’s only once we’ve studied these that we can assess if a bonus is worth promoting.

We want to make sure you get the right slots bonuses for the games you want to play, but we won’t push a site based on reputation alone.

Some casinos make you work harder than others to unlock your bonus, and we’ll let you know which offer the best value for the time and effort required.

How to Sign Up for the Best Slots Bonuses in the UK

  1. Choose a casino | Select from our list above and see which one offers the best slot bonus UK players can claim. Note that free spins bonuses let you play a few free online slots and find a game you love.
  2. Open an account | To play online bonus slots, players first need to create an account with that casino site.
  3. Check the terms and conditions | Although most bonuses come with similar terms, it makes sense to check them before making a deposit.
  4. Activate an online slots bonus | Some bonuses, such as no deposit bonuses or free spins, can be activated simply by opening a new account. Some require a promo code – if you’re unsure, contact customer support for help.
  5. Make a deposit | Most of the biggest bonuses require money to be paid into your account before your bonus can be used. Minimum deposits are usually at least £10 but often £20. Remember, many e-wallets are excluded from claiming bonuses, but you can still find PayPal casinos online that will give you a bonus.
  6. Start spinning! | Once you have your bonus, start using it to play slots! If you win using bonus spins or credit and have fulfilled the wagering requirements, you’ll be able to withdraw your funds or keep betting.

Top UK Casino Sites with Slot Bonuses

Most online casinos have some sort of welcome offer. However, if it’s just online slot games you’re interested in, then you can find specific slot welcome offers.

Here at Casinos.com it's our business to find the best slot sites in the UK with the best promotions. And what's more, every casino we feature is licensed by a reputable gambling regulator, so you know they’re legit.

Below are some of our favourite sites for the best slots bonuses in the UK:

Best Overall Slot Bonus: 888casino

  • Features: 10 no deposit, wager-free spins on Holy Mackerel Extreme Fishing every month for the rest of 2023.
  • Wagering requirements: none!
  • Need to know: free spins must be used within 24 hours and are worth £0.10 per spin. Once you've used all your free spins, any winnings go into your cash balance. 
  • Our view: 888casino wins this round with a slot bonus that's hard to ignore, partly because there's no deposit needed and no wagering requirements if you win. What's more, you get it every month, not just once like a welcome bonus. Having said that, you'll also get a welcome bonus, which you can grab by following the link below, when you sign up at 888casino.
888 Bonus 100% Welcome Bonus up to £100
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#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. 18+. Play Safe. 1st time depositor at 888casino only • £20 min deposit • Claim within 48 hrs • Valid for selected games • Bonus wins capped at £500 • 30x wagering – req. vary by game • Bonus expires within 90 days • Payment method & country restrictions apply • Withdrawal terms & T&Cs apply. #ad

Best Free Spins Slot Bonus: NetBet

  • Features: a 500 free spins slots sign up bonus when you use the code NBWELCOME500 and deposit £10. 
  • Wagering requirements: any winnings with the free spins are converted into bonus money and this must be wagered 40 times before you can withdraw any cash.
  • Need to know: you get 50 free spins as soon as you make your first qualifying deposit and then you get the remaining 450 free spins in batches of up to 75 spins within six days. Skrill, Neteller and prepaid card payment options are not included in this slots welcome bonus in the UK. 
  • Our view: this is a a healthy chunk of free spins to start enjoying slots online, and we appreciate the relatively low first deposit amount needed. 
NetBet Bonus Up To 500 Bonus Spins
Promo Code: NBWELCOME500
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#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. £10+ deposit, no e-wallets/prepaid cards, 50x wagering on Vegas Extra Spins, 40x wagering on Casino Extra Spins.

Best Cashback Slot Bonus: No Bonus Casino

  • Features: 10% cashback on your deposits when you lose all the money you deposited in a single day, forever.
  • Wagering requirements: no wagering necessary.
  • Need to know: the cashback bonus is available for 10 days after you made the associated deposit. Your balance must be below £10 to activate a cashback withdrawal.
  • Our view: we like No Bonus Casino's cashback deal, because it softens the blow of losing bets. What's more, the fact you don't need to wager the bonus makes it very straightforward. We also like how this slot bonus is so different to 99% of others out there.
No Bonus Bonus Always 10% Casino Cashback
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#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Lifetime offer for all customers | no wagering requirements | no max cash-out | gameplay will be reviewed for strategic or abusive play

Best Weekly Slot Bonuses: LeoVegas

  • Features: 30 10p free spins on Big Bass Bonanza every Thursday and 10 20p free spins on Rich Wilde and the Book of Dead every Monday.
  • Wagering requirements: 4 x wagering on casino games for the Thursday free spins and 3 x wagering on casino games for the Monday free spins. 
  • Need to know: to get the Thursday free spins on Big Bass Bonanza, log in and get your offer card between 09:00 and 23:59, before making your deposit of at least £25. For the weekly free spins on Book of Dead, log in between Monday at 09:00 and Wednesday at 23:59, get your offer card, and deposit at least £25.
  • Our view: LeoVegas has great slots bonuses, including these two weekly offers, and even if these deals are eventually removed, we can imagine them being replaced by other cool bonuses. Book of Dead is one of the most common casino video slots included in slots deposit bonuses, however, giving players free spins every week is pretty rare.
Leo Vegas Bonus 100% Welcome Bonus up to £50 + £6 Extra in Live Casino Chips
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#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Full T&Cs apply. New players only. 7 days to claim offer with a further 7 days to wager on Live casino. Wagering contributions vary. £6 bonus has 3 day expiry to use on selected Evolution games. 18+ GambleAware®: Gambling Help & Gambling Addiction | BeGambleAware

Types of Slot Bonuses in the UK 

Online casinos are ever-changing and bonuses evolve too. Any two offers are rarely the same, but plenty have a similar theme.

Below, we highlight a range of bonuses that you can access at several online casinos.

UK Slots Sign Up Bonus

These bonuses welcome new players to the casino. The welcome bonus is the most common type of bonus that you can get as it’s part of a casino’s strategy to get you to sign up.

Free Spins Bonuses

Free spins are a nice taste of the casino’s slots section, allowing you to get to know the casino and perhaps win cash too. You can get these offers on their own or with another offer, like a matched deposit bonus.

The number of casino free spins you get will vary but the winnings will usually need to be wagered before you can withdraw any real money. This means betting the value of the bonus one or more times. These bonuses could also be called bonus spins, extra spins, and super spins.

The following free spins offers are particularly attractive for slots fans: 

Brand Image
Free Spins 110
Bonus Deposit £10, Get £40 in Bingo Bonuses + 200 Bonus Spins
#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Deposit £10, stake £10 on Bingo, get £30 bonus (x4 Wagering) & £10 Club voucher, &/or stake £10 on slots, get 200 x 10p Fishin’ Frenzy The Big Catch Jackpot King (x20 wagering) & £5 Club slots voucher. Use winnings in cash balance/further deposit to claim both. £5 minimum withdrawal.
Brand Image
Free Spins 100
Bonus 100% Welcome Bonus up to £50 + 100 Bonus Spins
#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min £10 deposit & wager. Extra spins on Book of Dead (50 spins on day 1, 25 on day 2, 25 on day 3) 1p coin size. 40x wagering applies. Max cash out £250. Bonus expiry 30 days. Bonus spins expiry 2 days. Game restrictions apply.
Brand Image
Free Spins 66
Bonus Welcome Bonus up to £66 + 66 Bonus Spins
#ad. 18+. Gamble Responsibly. Begambleaware.org. New Customers Only. T&Cs Apply. Min deposit £20. Max bonus 100% up to £66 on 1st deposit. 66 spins on Big Bass Bonanza on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours.

Slots Deposit Bonus

The deposit bonus, or a matched deposit bonus, is very common. This is where the casino site will match the amount that you deposit up to a certain amount, e.g. you get a 100% bonus up to £100.

The value of offers like this vary depending on if you’re a new customer or a returning one. The bigger offers are usually reserved for attracting newbies, however, existing players can earn reload bonuses.

No Deposit Bonus

These are as rare as hens’ teeth these days, but if you’re lucky, you can still grab the odd no deposit bonus for slots. As the name would suggest, this is a bonus that the casino will give you for simply registering an account, with no deposit needed to trigger the bonus.

A bonus which requires no deposit could be free spins, or on a sports betting site, a free bet. Then, you’ll have to wager whatever you win with the bonus. 888casino has a free spins offer where you get 88 spins for no deposit, and any winnings must be wagered once.

New Slot Promo Offers

Some casinos promote special offers when new slot games are released. It gives players the chance to play real money slots for free.

The offers vary, but they typically include extra spins, slots tournaments with extra prizes based on your wins, gadgets, holidays, and cars.

Reload Bonuses

These offers are for existing players once they have made their initial deposit and usually claimed the welcome offer that goes along with this. Casinos will offer a bonus on a player's 2nd, 3rd, 4th and even up to 5th deposit at that casino.

Cashback

A cashback offer is where the casino site refunds a percentage of your losing bets or deposit from a certain day, weekend, week or month. You might need to hunt for these but they can be found, especially at newer casinos that might work harder to keep you.

Loyalty/VIP Bonuses

Many online casino sites have loyalty programmes with lucrative prizes up for grabs like holidays and cars.

A good loyalty programme will allow you to earn loyalty points whenever you bet. The more games you play, the more points you earn.

With loyalty points, you can progress to the next member level, which can give you reduced wagering contributions on bonuses, a personal account manager, and more cashback every week.

Mobile Slot Bonuses

The success and accessibility of mobile casinos in the UK and the similarity between mobile apps and desktop casinos means that mobile-only offers are now rare.

That being said, it’s worth noting most casinos allow you to clear a bonus by betting on mobile via your browser or their app, on Android or iOS. The only issue is that not all games on desktop are also available on mobile just yet.

Many casino sites have produced casino apps where you can play for real money, so they are worth downloading if you want to play away from home.

Deposit Bonus Slots

Some slot games like Rich Wilde and the Book of Dead and Big Bass Bonanza feature in lots of slots deposit bonuses. There's no single reason for this but these are factors:

  • These slots are famous and their names attract new bettors
  • These slots usually have an average RTP and some are highly volatile, which means on average, players won't win a fortune from the bonus, which protects the casino from huge losses. Progressive jackpot slots are usually excluded from slots bonuses for this reason.

Popular Deposit Bonus Slots

These are some of the slots we usually see in slot welcome offers and existing players rewards:

  • Rich Wilde and the Book of Dead
  • Big Bass Bonanza
  • Starburst
  • Fishin' Frenzy
  • Big Irish Bucks
  • Eye of Horus

All these slots have an RTP around 96% or lower, which means for every £100 bet, the average player will get £96 back. Of course, you can win much more than 96% or lose more than 4%. Your maximum win potential also depends on any bonus limits. It's important to remember free spins and other deposit bonuses are simply that though—bonuses—so it's best to treat them as a nice added extra.

With thousands of slot games to choose from, it can be difficult to know where to start. To help, we've put together the following list of the most popular slot games in the UK right now. These games are frequently eligible for bonuses, but always read the small print to be sure.

The 10 Most Popular Online Slots

Starburst
Software Provider
RTP
96.09%
Volatility
Low
Maximum win
£50,000
  1. Bally UK Bonus Play £10 Get 30 Bonus Spins
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Software Provider
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Medium
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How We Review the Best Slots Bonuses in the UK

Here at Casinos.com we do things a little differently. In fact, one of the reasons that we launched our site is to change the way casinos are reviewed. We don’t want to throw up a generic review and instead, we want to go deeper than other casino review sites.

Our Team of Experts

To do this, we’ve created a dedicated team for each aspect of online casino. This team is set up to find every great online slots bonus, and explain how each works and compares to the rest.

Our team includes professional casino players, game developers and casino writers. The team can cover reviews in greater detail than a one-man-band.

With each review, there’s a basic guideline our team follows, however, it’s not set in stone. And new slot sites pop up all the time, so we try to test all the best new online casinos when they hit the market.

Assessing Bonuses

The first port of call is the bonus and the amount of money on offer. ‘The bigger the better’ is a common misconception as wagering requirements also play a part.

Working through wagering can be challenging so we make sure all the terms and conditions set out by the casino are explained clearly.

Wagering contributions include things like the amount needed to clear the bonus for withdrawal, the time limit on the bonus, games that count, and the maximum bet value allowed with bonus money.

Evaluating What Each Casino Has to Offer

Once the bonus is reviewed, we move onto the wider casino and the number and quality of slot games. This includes the number of mobile slots online that are accessible, since many of you love playing slots on-the-go.

There should be hundreds of slots to choose from at the top sites, and we play-test as many as we can. It’s worth noting that lots of casinos use the same game providers and have many of the same slots, so we give extra points to sites with an original range of great slots. We also love it when a casino offers progressive jackpot slots.

Banking and customer support options are key to our reviewers too, as these can make or break your experience. The website might have the best games and bonuses in the world, but if you can’t get money in and out, it’s pointless.

We test bonuses and casinos every day, so check this page later in case we find even better slot bonuses.

Terms and Conditions: What are Wagering Requirements for Slots Bonuses?

The main concept behind wagering requirements is to make sure players don’t simply take the bonus money and run.

A typical offer would be based on 30x your bonus, meaning a £100 bonus would need £3,000 worth of wagers to clear that bonus (30 x £100). 

If you can win and bet £3,000 using the initial £100 bonus money, then you’ll be able to withdraw anything else as cash. The bonus money doesn’t become real money until you reach this point.

Exclusions

Bear in mind that some games will be excluded from wagering — usually, live casino games like blackjack aren’t included or they only count 10% to wagering. On the other hand, casino slots usually count 100% to wagering, although some slots are excluded. 

What’s more, some payment methods can't be used to deposit and claim bonuses, and you generally have to withdraw funds with the same payment method you used to deposit with. You should also remember that most online slots bonus funds expire after a certain number of days.

Is There a Limit on How Much You Can Deposit at a Slot Site?

Yes, while many casino websites offer you the best casino payment methods, you should know each has its own deposit and withdrawal limits, and withdrawal times.

Generally, debit cards and bank transfers offer highest deposit limits, with e-wallets and prepaid cards being lower.

Do All Slots Bonuses Require a Promo Code?

Very few bonuses come with promo codes these days but some still do. Just remember to keep an eye out for a bonus code, so you don’t miss out.

You need to enter the bonus code before making your first deposit or at the time of doing so. You won’t be able to go back and add one if you forget.

Wagering Calculator

If you’re still confused about wagering requirements, you can try our wagering calculator below! This makes it easy to understand how much money you need to bet through before you can withdraw your bonus. Just type in your deposit amount, the bonus percentage on offer, e.g. 200%, the wagering requirement, and how much the game, e.g. slots or blackjack, contributes to the bonus, and you'll see how much you need to bet using your bonus money.

Wagering Calculator
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A Slot Bonus Tip

Now you know more about the best slots bonuses in the UK, why not try one of the slot welcome offers featured at the top of this page?

Licensing Authorities and Testing Agencies

UK Gambling Commission
eCOGRA
Quinel
iTechLabs
GLI
Malta Gaming Authority
Alderney Gambling Control Commission
Isle of Man gambling supervision commission

Meet the editor

James Briscoe
James Briscoe Editor

James worked in non-league football as a press officer before copy-editing local and national newspapers from around Britain. He then stepped into the online casino world in Malta as a copywriter, and since then, he’s continued his iGaming journey as a freelance writer, and is delighted to be helping make Casinos.com content the best it can be.

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FAQs

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