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8 Best Expert Ranked Highest Paying UK Slots July

Farah Barry for Bookies.com

Farah Barry  | 22 mins

8 Best Expert Ranked Highest Paying UK Slots July

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If you’re aiming for a big win, it’s a good idea to choose the best payout online slots with a high Return to Player (RTP) percentage. While that might seem obvious, not everyone knows how to choose a great high RTP slot, so our team of experts at Bookies.com has put together a full guide to the UK’s highest RTP slots, which you can consult below when you play slots at your favourite online casino.

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Why Does Playing the Highest RTP Slots Matter?

Before you make a decision about which of the best payout slots to play, it’s important to understand how slots work. All slot games work with Random Number Generator technology, which means that the outcome of every spin is totally random, and everyone has the same chance of winning.

That said, some online casino slot games do pay out more than others, and it makes sense that these are the highest RTP slots. When you choose an online slots game with a high RTP, you’ll be more likely to get a payout over a long period of time.

The RTP is built into the slot game, and there’s nothing you as a player can do to influence it, but there are a few tips that you can follow to try to maximise your winnings even more. The most important one is to claim your welcome bonus offers and other regular promos. 

Here at Bookies.com, we have all the expertise to direct you to the best possible offers, and make sure that you get them when you sign up. Some of the offers you can expect include free spins on some of the slot games with the highest payout, or deposit matched bonuses that you can use to play on the top payout online slots of your choice. These special bonuses, like a deposit bonus might line you up for a big payout on slots, especiially if you're playing at one of the best payout online casinos.

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Best Payout Online Slots UK

These are some of the UK’s best slot games with the highest RTP! You can play online slots at a range of best slots sites UK players can access, and you’ll even get a special offer when you sign up.

Best Paying Slots (RTP)UK Online CasinoCurrent Sign Up Offer
Book of 99 (99%) Dream Vegas 100% match up to £300 plus 150 free spins
Mega Joker (99%) Pub Casino 100 match up to £100
1429 Unchartered Seas (98.5%) Casimba 100% match up to £20 plus 50 bonus spins
Marching Legions (98.12%) BetMGM Up to £200 cash plus 100 free spins
Rainbow Riches Pick 'n' Mix (98%) BetVictor 100% match up to £1,500 plus 150 free spins
Eye of Wukong (97.12%) bet365 50 free spins
Big Bass Bonanza (96.71%) Bally Casino Play for £10, get 30 free spins
Money Train 2 (96.40%) LeoVegas Up to £100 bonus plus 50 free spins

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Highest RTP Slots

Book of 99: Highest Paying Slot Game

Book of 99 from Relax Gaming has an extremely high RTP of 99%! The game comes with some truly amazing visuals, so it feels like the cool characters are right there in front of you! The paytable is really interactive (you get to it by clicking on the symbols on your screen), and overall it just feels like a really modern slot, despite not necessarily being listed among new slot games in the lobby.

You’ll be looking out for the special book symbols, which act as both the wild and the scatter. Get three of them and you’ll trigger 10 free spins that come with a wild collection feature, a pay-all-ways function, and the ability to re-trigger.

Mega Joker: Best Paying Online Slot

While many modern online slots focus on jaw-dropping visuals and lots of special features, Mega Joker does exactly the opposite. This is an older NetEnt title that comes with three reels, three rows, and a very high RTP of 99%. There are only five paylines, and overall the gameplay is extremely simple.

Mega Joker has the look and feel of a retro slot game that you might expect to see at an older land-based casino. In addition to the eponymous joker, you’ll be looking out for classic symbols like cherries, lemons, and 7s. One special feature that this game does have is a progressive jackpot slot, and you’ll need to switch the game to Supermeter Mode to stand a chance at triggering it.

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1429 Uncharted Seas: Highest RTP Slots

1429 Uncharted Seas by Thunderkick comes with an RTP of 98.6%, five reels, and 25 paylines. The game was released back in 2016, and it’s been a popular top paying slot game every since.

The game is set against a backdrop of an ancient map, and the themed symbols include monsters of the deep like mermaids and kraken. The game comes with expanding wild symbols which can be substituted for other symbols and expand when they’re part of a winning combination. If you land enough bonus symbols (a compass), you’ll enter the special bonus round where you could bag up to a total of 50 free spins!

Marching Legions: Best Pay Out Slots

Marching Legends is a popular, battle-inspired slot game from Relax Gaming. The game benefits from some really fantastic visuals, which are much better than most other slots, but it also has a unique, video game-esque style which sets it apart from most slots. The high RTP of 98.12% doesn’t hurt either.

You’ll want to look out for some very special features while you play. There’s the Marching Re-Spins feature, where a full stack of the legionnaire symbols will trigger a re-spins round, plus there’s also a Nudge feature where partial stacks have the chance to nudge onto the game grid. You can collect these special symbols as you go along, and if you get enough, you’ll trigger free spins!

Rainbow Riches Pick’n’Mix: Best Paying Slots UK

Irish-themed slots are a dime a dozen, but the Rainbow Riches series is one that does the theme really well! A spin-off of the original game, Rainbow Riches Pick’n’Mix from Barcrest comes with an RTP of up to 98%, 20 paylines, and a medium level of volatility.

The main differentiator of this game is that you’ll start off by choosing your favourite bonus, for the chance to win it more often. The bonuses all have their own special characteristics, for example some have multipliers, while other bonus rounds award free spins. Aside from the bonuses, you’ll have the chance to win when you match enough of the colourful number and letter symbols on adjacent reels from left to right.

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Eye of Wukong: Best Paying Online Slots Games

If you’re into Asian-themed slots, this Playtech title with a 96% RTP might be the perfect game for you. Rather than the usual symbols of coins and dragons, this game takes you on an eastern adventure that features monks, pigs, kings, and the special Sun Wukong monkey wild symbol.

Collect three or more scatter symbols on the reels, and you’ll get to choose between three different bonus games, each of which comes with a different multiplier! There’s the chance to bag up to 100 free spins, and if you get really lucky you might even take home a jackpot prize of 5,255x your stake.

Big Bass Bonanza: Highest Payout Online Slots

Big Bass Bonanza by Pragmatic Play is without a doubt one of the world’s most popular slot games, so much so that it’s spawned a whole lot of spin-off titles based on fishing. The RTP of the game can be up to 96.71%, and there’s a chance to win over 2,000x your stake.

You’ll be aiming to hook some special high paying symbols like fishing rods, tackle boxes, and of course the bass themselves. You’ll win by matching symbols on the 10 paylines, but there’s also the chance to win instant cash prizes, or enter the bonus round where you can get up to 20 free spins with big multipliers.

Money Train 2: Best Paying Online Slot Machines

With an RTP of 96.40%, Money Train 2 pays out more than the average slot game. This title by Relax Gaming has a huge 40 paylines, a high volatility, and stake limits that range between £0.10 and £20 per spin, so all players are catered for.

This game is a real adventure, set in a dystopian Wild West. Land two or more bonus symbols on the reels and you’ll get re-spins with a multiplier! There are also golden casino bonus symbols, collector symbols that help you bag cash prizes, and a very special sniper symbol that can double your wins!

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Sign Up to Play The Best Paying Slot Games UK

Before you can start playing top paying UK slot machines, you’ll need to create your online casino account. The first thing to do is browse our list of casinos on this page, so that you can get a flavour for which one might be right for you. Once you’ve chosen the casino, you should sign up via a link on this page, so that we can ensure you’re eligible for the best possible offer.

Once you’re on the online casino site, you’ll need to spend about two minutes filling in the form to create your account. You’ll use basic details like your name, email address and password for logging in, date of birth, and address. 

Most UK online casinos will then verify your identity automatically, but if that’s not possible, you should be prepared to submit verification documents like your ID and proof of address. The whole sign up process is designed to offer you security and protection, so stringent verification is a hallmark of a really high quality online casino.

How We Choose the Best Paying Online Slots

The main factor that we consider when we’re choosing the best paying slots is the Return to Player Percentage (RTP), but there are also other considerations, and even some exceptions when it comes to the payout percentage.

The most obvious thing we look for is a high RTP. If you’re not totally familiar with RTP, it’s very easy to understand - it refers to the amount of money staked on a game that should theoretically return to players over time. So, for example, if a payout slots game has an RTP of 96%, that means that over time, for every £100 that’s wagered, abut £96 will return to players. It’s important to remember that RTP is based over a long period of time, so choosing a high RTP game doesn’t necessarily mean you’ll have a win during a single gaming session, but it’s a good indicator that a slot does pay out. Most new online slots have an RTP of 96% to 98%, but we definitely look on the higher end when we’re considering slots for this list.

One exception to the high RTP rule is progressive jackpot slots. These games (like Mega Moolah), tend to have lower RTP, but they do still pay out a lot, simply based on the fact that you have the chance to win massive prize pots that could reach millions of pounds.

For an online slot game to make it onto our list of best payout online slots, the gameplay also needs to be really good. We look for modern and immersive visuals, and fun themes that can be as diverse as adventures, animals, and ancient worlds. Special features are an extra plus, so for example many games on our list have wilds, multipliers, scatter symbols, expanding reels, cluster pays, megaways, and a whole lot more.

Finally, to make it onto our list of best paying online slot machines, a game needs to be available at one of our top-rated UK online casinos. There’s no use in finding a great game with a high RTP, that isn’t available at a reputable online casino.

RTP of Other Online Casino Games?

Just like slots, other online casino games also come with RTP, and if you’re going to be delving into the world of live casino games, it’s important to understand how their RTP works. The good thing is, some online casino games have even higher RTPs than slots, particularly the best online scratch cards, so they can be a great option.


Blackjack is known for being a really high paying game, with the RTP at some tables going up as high as 99%. The important thing to remember about blackjack is that there is some strategy involved, as opposed to slots, where the outcome is totally random. You should also consider the specific rules of the online blackjack table where you’re playing. It can be a little difficult to figure out the RTP of individual blackjack tables, so it’s best to check the game info, where you can get the most accurate information and you can decide on the best online casino for blackjack.


Roulette is a little more complicated than some other casino table games, because the RTP depends on the specific bets you’re making, as well as the type of live dealer roulette you’re playing. For example, American Roulette has two green zeroes on the wheel, which means that the RTP is slightly lower than European Roulette, which only has one zero.


Live online baccarat is very popular because it has a high RTP and a low house edge. The RTP for each type of bet is slightly different, for example if you’re betting on the player’s hand, it’s 98.76%, the banker’s hand is 98.94%, and a tie is 85.64% for an eight-deck game or 85.56% for a six-deck game.

Video Poker

The RTP for different video poker options varies a little, but you can always bank on it being really high. For example, it might be around 99.2% for certain games, which means you have a good chance at a win, if you understand the rules, and apply some strategies.


Most UK online casinos don’t have too many craps options, but the Evolution Gaming tables can have an RTP that ranges from as high as 99.17%, but as low as 88.18%.

Best Paying Slots Payment Methods

Whether you're playing on their site or on their casino apps, players in the UK are really spoiled for choice when it comes to online casino payment methods. Most top casinos offer a range of popular options, ranging from traditional methods like bank cards, to more digital methods like e-wallets and crypto.

Most UK players tend to stick with debit cards as their main payment method at online casinos. Debit cards are totally secure, and making a deposit is just as easy as making any other online transaction. The one slight drawback is that bank card withdrawals tend to take a few days to reflect in your account, as this is dependent on your bank, rather than on the casino.

If you want to avoid delays in withdrawals, e-wallets like Skrill, Neteller, and PayPal casinos are a good option. These allow you to transfer money directly to the online casino, without needing to provide your personal bank details or card details. This adds an extra layer of security to your transactions. Prepaid cards are another way that you can preserve your safety, and paysafecard is a very popular option. If you’re using a prepaid card for deposits, keep in mind that you’ll need to choose another method for withdrawals (for example a bank transfer). This also applies if you're at a pay by mobile casino and at casinos with apple pay.

Cryptocurrency is gaining traction as a payment method, but it’s not available at all of the best online casinos just yet. While crypto payments won’t be for everyone (mainly because you need to have purchased the specific crypto coins before you can deposit) but it’s very good for preserving anonymity, and the transactions tend to be really quick. Some online casinos even have exclusive bonuses for crypto deposits.

Highest Paying Slots FAQs

What are the best slots to play?

It’s always a good idea to choose a high RTP slot machine, as this could mean that you have a higher chance of a win! Some of our top high RTP slots include Mega Joker, 1429 Uncharted Seas, and Big Bass Bonanza. Ideally, look for games with an RTP of 97% or higher.

What slot machines have the best odds?

Each online slot machine comes with a built-in Return to Player percentage, but they also all run on Random Number Generator technology, so you can never guarantee a win. Some high RTP UK slot games include Money Train 2, Book of 99, and Rainbow Riches Pick’n Mix.

What is the best time to play slot machines?

There’s no good or bad time to play slot machines, as they all use Random Number Generator technology, so there’s no external influence on what symbols land on the reels with each spin. The best time for you to play slot machines is whenever you feel the most comfortable to do so!

What is the highest payout slot machine?

Most modern video slots have an RTP of 95% to about 98%, but there are some that go a little bit higher than this! Book of 99% has an RTP of a huge 99%, and 1429 Uncharted Seas is also really high, at 98.5%.

What online slots have the highest RTP?

Lots of online slot machines from top providers have a high RTP. We’d recommend titles like Book of 99, Marching Legions, Money Train 2, and 1429 Uncharted Seas, but there’s no shortage of high RTP slot games at top UK online casinos.

About the Author

Farah Barry for Bookies.com
Farah Barry
Farah is an online casino expert, having worked with one of the UK's biggest gambling brands, before turning her attention to freelance writing. When she's not writing about all of the latest casino and slot releases, you'll find her planning her next trip to Las Vegas.