Highest RTP Slots in the UK
Slots with the highest RTP are very much in demand because they mathematically give the best return to the player. Theoretically, therefore, playing a high RTP slot should result in smaller losses and longer playing sessions.
Below, we review some of the highest RTP slots available to UK players, as well as give you some advice on how you can maximise your gameplay to enjoy them even more.
The Best High RTP Slots for UK Players – June 2025
| Slot | Max. Win | Feature Score | RTP | Where to Play |
|---|---|---|---|---|
| Book of 99 | 12.075x | 7.7 | 99% | Play on BetMGM |
| Mega Joker | 2,000x | 7.5 | 99% | Play on PlayOJO |
| Big Bad Wolf | 1,224x | 7.4 | 97.34% | Play on Grosvenor |
| Dead or Alive 2 | 111,111x | 8.9 | 96.82% | Play on NetBet |
| Football: Champions Cup | 2,000x | 8.2 | 96.82% | Play on LeoVegas |
| Divine Fortune | 25,000x | 7.7 | 96.59% | Play on All British Casino |
| Legacy of Dead | 5,000x | 8.1 | 96.58% | Play on 888 |
| Madame Destiny Megaways | 5,000x | 8 | 96.56% | Play on 32Red |
| Rick and Morty Megaways | 50,000x | 8.3 | 96.55% | Play on BetMGM |
| The Dog House Megaways | 12,035x | 9 | 96.55% | Play on Slots Animal |
Top 5 Highest RTP Slots Online
Our expert iGamingNuts team have come up with their favourite slots with the best RTP in the UK. Let’s take a look at what they have to offer, and where you can play them:
Book of 99
Book of 99 brings an eye-popping 99% RTP, expanding symbols during free spins, and a wild collection mechanic to trigger bonuses. It’s ideal for bonus wagering and fans of ‘Book of’ slots. Add in a max win of 12,075x, and you’ve got a high RTP game worth spinning.
Provider
Feature score
RTP
99%
Volatility
Medium
Progressive Jackpot
–
Up to £200 Extra + 100 Free Spins
Special Offer
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Mega Joker
Mega Joker offers a nostalgic, no-frills slot experience with a top-tier 99% RTP. Its Supermeter Mode adds risky, high-reward potentiab, while a progressive jackpot builds the excitement. It’s volatile, old-school, and all about chasing that massive payout: perfect for classic slot lovers and thrill-seekers alike.
Provider
Feature score
RTP
99%
Volatility
High
Progressive Jackpot
£3%
Get 50 Free Spins (no wagering)
#ad. 18+. Gamble Responsibly. Gambleaware.org. First deposit only. Free spins on Big Bass Bonanza, worth 10p each. Min. deposit £10. Excludes new players in Northern Ireland.
Big Bad Wolf
Big Bad Wolf mixes fairytale charm with smart features like Swooping Reels and Wild Pigs that ramp up your win potential. With a max RTP of 97.34% and iconic visuals, it’s perfect for players after low-pressure fun, though big-win hunters might find the 1,225x max a bit underwhelming.
Provider
Feature score
RTP
97.34%
Volatility
Medium
Progressive Jackpot
–
Play with £50 when you deposit £20 +100 FREE SPINS
ad. 18+. Gamble Responsibly. Gambleaware.org. Min. first deposit of £20 to receive a £30 bonus. Wager x30.
Dead or Alive 2
Dead or Alive 2 is a legendary high-volatility slot with jaw-dropping win potential (up to 111,111x). It delivers three distinct free spins features, slick Wild West visuals, and a sharp 96.82% RTP. If you love intense spins and epic risks, this cult sequel is a must-play.
Provider
Feature score
RTP
96.82%
Volatility
High
Progressive Jackpot
–
100 Welcome Free Spins With No Wagering
#ad. 18+. Gamble Responsibly. Gambleaware.org. New customers only. £10 min deposit. Opt-in and Bet £10+ on any slot, winnings paid as cash. 100 wager Free Spins on Big Bass Splash, £0.10 per spin. £100 Max win. Additional T&Cs apply.
Football: Champions Cup
Football: Champions Cup stands out with its team-picking mechanic and brilliant bonus rounds like penalty shootouts and knockout tournaments. With overlay wilds, medium volatility, and a 96.82% RTP, it’s perfect for football fans who want themed gameplay with decent win potential and interactive features.
Provider
Feature score
RTP
96.82%
Volatility
Medium
Progressive Jackpot
–
Get 50 Free Spins on Big Bass Splash by playing £10
New cust only. Opt in & deposit £10+ in 7 days & wager 1x in 7 days on any eligible casino game (excluding live casino and table games) for 50 Free Spins. Wagering contributions vary. Free Spins worth 10p each on Big Bass Splash. 3 day expiry. T&Cs apply. 18+ GambleAware.org.
What is a High RTP Slot?
If you’re new to the online casino world, and have no idea what these metrics mean, we’re going to explain it in a very simple manner.
Understanding Return To Player (RTP)
In online slots, the RTP is a metric that shows the percentage of bets which goes back to players. Let’s take the example of a game with a high RTP of 98%. It basically means that, on average, a player wagering £100 on the game can expect to get £98 back. This metric is pretty useful when choosing which game to play on, as well as assessing the risks involved with it.
Although it’s a good indicator of what you can expect, you should remember that it’s only an average, and that in no way are you guaranteed to get that amount back for every £100 you wager!
RTP vs. Volatility
Return To Player shows how much a slot pays back on average, while volatility is more of an indicator of “how” it pays. It shows the frequency of wins, and their average amount. For example, a low volatility slot is more likely to reward players with small, regular wins, while bigger payouts might be quite hard to get. High volatility slots, on the other hand, can lead to long losing streaks, with a few medium to high wins here and there. However, when a big win occurs, it usually is much bigger than on low volatility games.
How is RTP in Slots Calculated?
Slot RTPs are calculated using simulations run over millions of spins. Developers use random number generators (RNGs) to test payout ratios across all possible outcomes. The final RTP is then set based on the average return. While some providers publish a fixed RTP, others offer adjustable RTP ranges, so casinos may offer different versions of the same slot. Always check the RTP in the game info screen, as it might help you make a better decision!
RTP in Jackpot Slots
In slots using a progressive jackpot system, part of your bet goes into the pot, meaning that unless you win the big prize, you’re pretty sure to lose a small percentage of every wager you place.
This translates into jackpot slots having lower RTP than most games. While the average Return To Player is somewhere around 96%, and some of the best paying slots can have a ratio up to 99%, jackpot games usually have RTPs below 96%, and even lower than that (most of them are below 94%). These low RTPs are balanced by the possibility of winning some huge jackpot, but you’ll obviously need a lot of luck to get that sort of prize!
However, there are some exceptions to this rule. As mentioned earlier, Mega Joker and its 99% RTP offers a progressive jackpot as well! So, always check for the RTP before you make your decision.
Highest RTP Slots Tips & Strategies
Although games with high RTP pay out more on average, the best online slots in the UK are still based on luck, so no win is guaranteed. However, there are some ways to play smarter and maximise your gameplay, so that you don’t end up losing too much money in a single session. These tips are more of a set of general advice for you to come prepared to your next session on high RTP slots:
- Set a budget, and stick to it, especially if you end up losing it all.
- Use free spins and casino promotions, including potential no-wagering bonuses, for some risk-free gameplay.
- Check the game info, to see if the version you’re playing on is the right one, if the correct RTP, and if that RTP is available in the base game, not only in certain modes.
By following these few tips, you can enjoy longer, low-risk sessions!
Where to Play High RTP Slots Online
Here is a selection of some of the best online casinos to play high RTP slots in the UK:
See the key factors behind the iGN Rating for PlayOJO Casino:
- Safety Index = Excellent – PlayOJO ensures player safety with strong SSL encryption, a dedicated “Safer Gambling” section, and tools like Safe Mate, which tracks gambling habits and offers personalized tips. Additional features include child protection tools and playtime limit options, reinforcing its commitment to responsible gaming.
- Advantages: No wagering on bonuses, an extensive selection of over 5,000 games, daily Kickers promotions, and a comprehensive safer gambling section.
- Disadvantages: Limited table and live game options, and no deposit-matching welcome bonus.
Minimum deposit: £10
General number of games: 5000
Payment speed: up to 2 days
Free spins: Get 50 Free Spins (no wagering)
Get 50 Free Spins (no wagering)
See the key factors behind the iGN Rating for Netbet Casino:
- Safety Index: Excellent – NetBet is fully licensed by the UKGC, follows eCOGRA guidelines, and offers strong responsible gambling tools. Trustpilot reviews show no major red flags, with fairness ensured through regular game audits.
- Advantages: Higher Trustpilot rating (3.7) than most UK casinos, feature-rich mobile apps, generous bonuses including a 100 Free Spins welcome offer with no wagering requirements, and a seven-level loyalty programme open to all players.
- Disadvantages: Live chat only works from 09:00 to 23:00, and no phone support is available for UK players.
Minimum deposit: £10
General number of games: 2000
Payment speed: 2–48 hours
Free spins: 100 Free Spins With No Wagering
100 Welcome Free Spins With No Wagering
See the key factors behind the iGN Rating for Grosvenor Casino:
- Safety Index = Excellent – Grosvenor Casino is fully licensed by the UKGC, adheres to eCOGRA standards, and provides robust responsible gambling tools. With top-tier security measures in place, it stands out as one of the safest online casinos.
- Advantages: The low £5 minimum deposit (except for PayPal), a wide range of promotions including live dealer offers, exclusive live games streamed from Grosvenor’s land-based casinos, and a strong reputation as a trusted UK brand since 1970.
- Disadvantages: Limited withdrawal options with only four available, Live Chat support restricted to 07:00 – 22:30, and a relatively modest welcome bonus capped at £30.
Minimum deposit: £5
General number of games: 1000
Payment speed: Instant to 3 days
Play with £50 when you deposit £20 +100 FREE SPINS
Conclusion
High RTP slots are the smart player’s choice for better long-term value. While they don’t promise wins, they do offer better returns on average than lower RTP alternatives. When combined with a few simple strategies, sessions on games like Mega Joker and Book of 99 can last a lot longer than expected. If you want to test a specific game before playing for real money, we’ve got quite a lot of free demos available for you in our slot reviews.
FAQ – Highest RTP Slots
What is considered a high RTP slot?
The average RTP in online slots is around 96%. Any RTP higher than that can be considered as high.
Can I win more on high RTP slots?
Over time, yes, high RTP slots pay back more on average. But the outcome still is random, and no win is guaranteed.
What’s the highest RTP in the UK?
Some titles can boast impressive percentages, such as Book of 99 and Mega Joker, with a very high 99% RTP.
Where can I play the best paying slots?
Lots of trusted online casinos in the UK, including NetBet, LeoVegas, or PlayOJO, offer high RTP slots.
I wouldn’t place The Doghouse Megaways among the best-paying slots, as its RTP isn’t very high. Also, from my experience it’s quite hard to get the free spins, so I suggest you to find better games for the benefit of players. Thanks.