If you enjoy spinning the reels at UK online casinos, one of the most important things to look at is the RTP (Return to Player). This percentage shows how much a slot is designed to pay back to players over time. The higher the RTP, the better your chances of winning big.

In this guide, we’ve researched and compared a wide range of online slots to highlight the ones with the highest payout rates available in the UK. You’ll discover top slot recommendations with excellent RTPs, as well as the leading online casinos where you can try them out for real money.

The Best Payout Online Slots

Slot Game	Developer	RTP %	Paylines / Grid	Volatility	Max Win
Mega Joker	NetEnt	99%	Varies	Medium	N/A
Blood Suckers	NetEnt	98%	25	Low	1,014x
Jokerizer	Yggdrasil	Up to 98%	Varies	High	£60,000
White Rabbit Megaways	Big Time Gaming	97.77%	Up to 240,000	High	Huge
Dead or Alive 2	NetEnt	96.82%	9	High	111,000x
Thunderstruck 2	Microgaming	96.65%	243	Medium	8,100x
Buffalo King	Pragmatic Play	96.06%	4,096	High	N/A
Wild Cauldron	Quickspin	96.06%	4,096	High	200,000+
Book of Ra Deluxe	Novomatic	96%	10	Medium	N/A
Bob Marlin Goes Deep	Yggdrasil	96.80%	5×3 → 5×7 (16,807 ways)	Low	3,905x
Big Bass Reel Repeat	Reel Kingdom	96.51%	5×3 / 10 lines	High	5,000x
Gates of Olympus Super Scatter	Pragmatic Play	96.50%	6×5 scatter-pay	High	50,000x
The Dark Watchers	bet365 Software	96.35%	5 reels	Medium	N/A
Bucket of Bass – New Slot with HIGH RTP!	Games Global	96.16%	5×3 / 25 lines	Medium	6,250x
Le King	Hacksaw Gaming	96.14%	6×3 + jackpots	Medium	20,000x
Majestic Fury Power 5	Blueprint	95%	5 reels	Medium	5,000x

Top 7 High RTP Slots for UK Players – My Ultimate List

Bob Marlin Goes Deep 

• Developer = Yggdrasil 
• RTP = 96.80%
• Variance = Low 
• Maximum Win = 3905x

Yggdrasil takes players on an underwater adventure in Bob Marlin Goes Deep, where treasures wait beneath the waves. Land five identical fish to trigger a round of free spins, and watch as the reels expand from the standard 5×3 layout to a massive 5×7 grid with up to 16,807 ways to win. With its player-friendly RTP and low volatility, this slot offers frequent payouts and plenty of reasons to keep spinning.

Big Bass Reel Repeat

• Developer = Reel Kingdom
• RTP = 96.51%
• Variance = High
• Maximum Win = 5000x

You’ve probably tried the popular Big Bass series before, but this new instalment stands out as more than just another reskin. The fishing adventure unfolds on a classic 5×3 grid with 10 paylines, featuring the Fisherman Wild and Fish Money symbols that can deliver wins of up to 5,000x your stake. The high 96.51% RTP can also help you reel in a decent win.

Gates of Olympus Super Scatter 

• Developer = Pragmatic Play
• RTP = 96.50%
• Variance = High
• Maximum Win = 50000x

Released in April 2025, Gates of Olympus Super Scatter is one of the trending slots at Rialto Casino. This game follows in the original title’s footsteps, perfectly capturing Mount Olympus’s chaos. The 6×5 grid uses a scatter-pay engine alongside a rewarding Tumble feature. With some luck and strategic play, you can win the Super Scatter Jackpots of up to 50000x. 

The Dark Watchers

• Developer = bet365 Software
• RTP = 96.35%
• Variance = Medium 
• Maximum Win = N/A

The Dark Watchers is a spooky title that you can exclusively play at bet365. This slot takes you into the dark forest surrounded by silent trees. However, all hope isn’t lost in this 5-reeler. The medium volatility rating and friendly payout rate ensure you don’t leave the forest empty-handed. It’s a great option if you like the spooky slot themes. 

Bucket of Bass

• Developer = Games Global
• RTP = 96.16%
• Variance = Medium 
• Maximum Win = 6250x

Bucket of Bass is another brand-new fishing adventure released by Games Global in September 2029. This slot is exclusively available at William Hill, where you can enjoy the laid-back fishing adventure with an above-average RTP. The fishing action pans out on a standard 5×3 grid with 25 bet lines. It has a medium volatility rating, making it ideal for casual gamers. 

Le King 

• Developer = Hacksaw Gaming
• RTP = 96.14%
• Variance = Medium 
• Maximum Win = 20000x

We’re a big fan of Hacksaw Gaming’s mischievous raccoon, Smokey, who always finds new ways to entertain. This time, Le King takes him to Flam City (Las Vegas) for some groovy action on a 6×3 gameboard. The Cascading Reels feature works hand in hand with the medium volatility and solid RTP to deliver steady wins, while four fixed jackpots add extra excitement to the mix.

Majestic Fury Power 5

• Developer = Blueprint
• RTP = 95%
• Variance = Medium 
• Maximum Win = 5000x

Lastly, try your slot luck on Majestic Fury Power 5 at William Hill Vegas. This game brings back the classic cash slot that UK players love with the familiar Cash Strike bonus. However, the new action happens in a 5-reel setup with a Power Play feature where Cash and Collect symbols are active. The medium volatility rating also compensates for the below-average RTP. 

What are the Best Payout Slots?

Slot payout is another term mainly used to refer to the game’s RTP. Simply put, the RTP (Return to Player) is the theoretical payout percentage of an online slot. We call it theoretical because nothing is certain in online slots. 

A high RTP slot is a game that offers a high payout rate, preferably more than 96%. For example, a slot game can have an RTP rate of 96.50%. It means the maximum this slot can pay out in the long term from every £100 wager is £96.50. Game developers calculate this rate based on millions or billions of spins. 

How to find online slot RTP

There are several ways to discover an online slot’s RTP. The most reliable way is to launch the game and open the paytable information. Most slot developers indicate the information on this in-game page. 

Another way to find this information is by clicking the “Info” icon on the slot thumbnail at casinos like bet365. Alternatively, you can visit the official game developer’s site to find the game’s information.  

Understanding the Relationship Between Slot RTP and Volatility

Slot RTP and volatility are vital features that determine how a game pays out in the long term. However, volatility is a little different. This feature determines the pattern of payouts in the long term. Generally, slots can have three possible volatility ratings as follows:

• High Volatility: These slots pay out decent amounts, although less frequently, making them ideal for high-risk gamers. 
• Low Volatility: These slots pay out small amounts but more frequently. They are perfect for casual gamers looking to enjoy extended gameplay. 
• Medium Volatility: These games strike the right balance between high and low volatility experiences. You can win decent rewards more frequently. 

As you can see, the RTP isn’t the only factor determining slot payouts. By getting the right balance between the RTP and volatility, you can enjoy more rewarding gaming experiences. Remember, these are just theoretical estimations that game developers provide. 

Best Sites for High RTP Slots & Good Payout Chances

Here are the top 4 brands where you can play the best payout slots in the UK:

bet365

Launched in 2001, bet365 is a household name in the UK’s iGaming scene. This casino houses over 2,000 games, the majority being online slots. You can play slots from top names like Blueprint, IGT, Games Global, and Playtech. You can also filter the game library by software, volatility, RTP, and theme.  

William Hill Vegas

William Hill Vegas impressed us with its top-quality selection of exclusive online slots. At this casino, you can play a range of new and exclusive slots, table games, and live dealer titles with William Hill branding. William Hill is also the best place to play high RTP jackpot slots linked to networks like Mega Moolah, King Millions, and WowPot. 

Rialto Casino

Rialto Casino is a small but highly popular casino in the UK. This one of the best payout casinos provides a beautiful dark-themed layout that lets you access games from top names like Blueprint, Reel Kingdom, and Play’n GO. Some must-play titles at Rialto include Big Bass Bonanza, Book of Dead, and Wolf Gold 4 Pack. You can also play a wide selection of progressive jackpots with nice payouts. 

The Vic

At The Vic, a sister site to Rialto, you can enjoy your favourite slots in a classy setting. The elegant layout with gold accents creates the feeling of a VIP casino lounge. The site features over 800 slots, ranging from classics to video slots and progressive jackpots. With an average payout rate of 96.38%, The Vic offers both style and strong returns. 

Advantages and Disadvantages of Playing High RTP Slots

Advantages	Disadvantages
Exposure to a lower house edge.	Some high RTP slots have high volatility.
Higher winning chances in the long term.	Can create unrealistic winning expectations.
Longer gaming sessions with smaller budgets.	Developers can limit bonus features.
More appealing to casual gamers.

What are the best slots sites with high RTPs available in the UK?

Online Casino	Slots and Features	Payout Rate (RTP %)
bet365 UK Casino	Best payout slots & games	Top industry RTP
10bet Casino	Quick withdrawals	97.01%
Unibet Online Casino	Highest payout rate	96.5%
Grosvenor Casinos	Highest payout casino	Approx. 97%
888Casino	Notable for best payouts	96.2%
32Red Casino	Reliable payouts	95.51%
Betfred Casino	High RTP slots	96.5%
Betway Casino	Solid payout performance	96.36%
Grand Ivy Casino	Competitive RTPs	96.5%

FAQs About Best RTP Slots UK