Best RTP Slots | Best Payout Slots in the UK

Slots are the most fun part of any casino, but we all know it doesn’t matter how much fun a game is. That will always be secondary to winning. Casinos can have thousands of slots, so to help you out, I'll take you through the 10 best payout slots in the UK.

When I talk about the highest payout slot machines, I’m referring to slots offering the highest return on your money. Not in the short term, but on average, over time. This means playing games with the best RTP (Return to Player) percentage at the best slot sites.

Let’s take Mega Joker by NetEnt as an example. With an impressive RTP of 99%, it’s one of the best payout slots. In theory, you’d expect it to pay out £99 for every £100 you wager. But keep in mind that the RTP percentage is a long-term average based on all players' bets and winnings.

Of course, you could win much more than 99%, but you could also end up with nothing. That’s the nature of these games, whether they’re the top payout slots or not. Still, it’s worth playing slots with the best payouts because, when you do win, the rewards are bigger.

The best way to think about high RTP slots is that they’re generally more generous than low RTP titles. But luck will always determine whether you’re the one to take home a share of that cash pot. There’s never a surefire guarantee, so keep that in mind when playing the highest payout slots.

I want to make sure you know that casinos can adjust RTP settings within a given range. The site chooses which RTP to use, so it’s important to research this before playing. Finding online casinos with the highest slot payouts can greatly increase your potential profits.

Some games can have several RTP settings, with the lowest being around 88-90% and the highest reaching close to 98%. This means the same game can offer very different return rates depending on the casino’s chosen configuration.

RTP is crucial because it tells you how much money you could expect back on your bets on average, making it an essential factor in assessing a game’s value. Factors like volatility and bonus features also affect gameplay, but RTP remains the main metric. It helps to understand a game’s payout potential.

Before a slot game is released, its RTP is calculated over millions of spins, and this percentage varies between games. This information is available to everyone, so it’s worth checking before playing.

Every online casino game has an RTP, including table games and live dealer titles. While slot RTPs often fall between 94% and 96% at UK casinos, table games like blackjack can have even higher RTPs. Choosing top payout slots can improve your chances of getting better returns.

Studying the payouts of each game is the easiest way to check the RTP for the best online payout slots. Here are my top tips:

1. Check Our Reviews. If it's a game we've written a review for, follow the link to the dedicated page. We'll tell you the RTP rate and detail gameplay features, bonuses, and other key stats. 
2. Visit a Trusted Casino Site. If we don't have a review for the game, visit the casino site you know and trust. We list some of the best online casinos in the UK on this site, so take your pick. 
3. Check the Paytable. Find the slot you want to play and click the ‘i’ icon in the paytable. Scroll past symbol payouts and bonus feature descriptions. Providers usually state the default RTP percentage under the game rules section.
4. Visit the Developer's Website. If the paytable doesn’t have this information, visit the game developer’s website and check the RTP there. Most game studios make this information public.

Want to compare games? We designed this tool to help you choose the slot games that best suit your playing style.

To get started, select a few games from our lists above or any other titles you know and like. The tool will create a side-by-side comparison so you can choose based on the best payouts and other stats.

Note: slot comparison tool will open in a new window. 

In the previous sections, I explained why RTP is important - it provides valuable insight into your expected returns. Now, let’s explore other key metrics that make the best payout slots stand out.

RTP and volatility are best friends. RTP helps you find the highest payout slots, while volatility influences how often and how much you can win.

High volatility signals risky gameplay and low volatility slots offer fewer risks. These are the three main types: 

• High volatility: prepare for dry spells – these slots are budget eaters. But the potential payout can be very rewarding when a jackpot hits. 
• Medium volatility: medium volatility slots can offer small and big wins. 
• Low volatility: low volatility slots deliver modest but frequent wins - perfect for small budgets.

Most slot paytables will tell you how volatile the game is. If not, read our online slot reviews – we always include RTP and volatility.

Jackpot slots come in two types: fixed and progressive. 

Fixed jackpot slots offer in-game prizes that don’t increase in value. Progressive jackpots grow as more people play the game and often snowball into millions. For example, Jon Heywood won a record-breaking £13.2 million jackpot with a mere £0.25 on Mega Moolah. 

This is possible because a small percentage of each bet from millions of players worldwide is put aside and added to the jackpot prize total. The jackpot will reset and climb when someone like Jon wins it. 

With the potential for large jackpots, progressive slots are often seen as some of the best payout online slots UK casinos offer. But as the jackpot pool grows and more people play, your chances of winning the top prize decrease. High volatility and lower RTP also make wins less predictable

Here are the three progressive jackpot slots I recommend trying.

Invented by Big Time Gaming, Megaways is a pretty cool slot mechanic. It gives you up to 117,649 different ways to win on every single spin. 

Dragon Born was BTG’s first Megaways game, but Bonanza made this engine famous. Many developers have remastered popular titles into Megaways versions to meet the demand for such slots.

Visually, they’re like the usual video slots online but don’t use the standard paylines. Instead, each time you spin, the size of the reels will change – each reel can have up to seven symbols. This means that sometimes you’ll have more symbols and rows, and other times you will have fewer.

Sounds complicated? It is, and it isn’t. You win if you match three or more symbols in a row on neighbouring reels. It’s even better when you play Megaways slots with tumbling reels, as they can offer many wins on the same spin.

Spins bonuses are a game-changer when it comes to making your funds go further. They’re like little gifts you get from the casino on sign-up or when you deposit. 

When joining a new casino with a free spins bonus, you can play slots without dipping into your own funds. Spending less money at the outset is always a good tactic for tipping things in your favour right from the get-go. 

Many of our favourite online casinos offer them for free as extra promotions to keep the fun going. Some are free from wagering requirements, so you can keep what you win.

While you’re here, check out these three of the best free spins promos available right now. But before claiming any spins promo, always remember to check the bonus terms. Not all slots qualify for free spins promotions. 

Moreover, only certain payment methods may unlock the offer. Plus, you'll usually need an initial deposit to kick things off. Still, these deals are an excellent way to get some extra bang for your buck - just check that small print. 

It’s all well and good finding a big payout slot game, but how do you play it smart? Here are the top tips from our casino experts on how to make the most of these titles.

Looking for free slot bonuses is always a good idea. 

The best paying slots sites often offer free spins as part of a welcome offer. Some may even have no wagering requirements, allowing you to keep all your winnings.

Still, always remember to read the small print to check the rules, such as game exclusions, validity, and winning caps.

Playing slots in demo mode is smart, whether it’s time-tested titles or new releases. This way, you can test every bonus round and feature without risking your money. And if you don’t like it, you haven’t spent a penny on these free slots in the UK.

Not all casinos offer demo play, but if you can, play for fun to see how the game behaves and only then bet real money.

It’s tempting to keep playing even when you are losing. But setting a budget and sticking to it is more fun than chasing losses. 

If you keep landing false or empty spins, it’s time to step back and reevaluate your strategy. You can always try using the casino’s deposit limit tools to help you manage your spending.

Don’t follow the crowd; play games that are right for you.

Work out what kind of games suit your playing style and budget. Do you prefer high-risk games that pay out big but rarely, low-risk games that pay out small but often, or something in the middle?

Choosing a suitable level of volatility will only improve your gameplay experience.

Remember to gamble responsibly. The best strategy you can have is to know your limits. It’s easy to get over-excited about landing prizes, but make sure you’re not losing more than winning. 

Play smart by setting limits and keeping your budget in check. Gambling is meant to be fun, but if it’s not anymore, be ready for a quick cool-off.

Our Best Payout Casinos with Big Payout Slots

Just before you go, here are some of our top-rated UK casinos with the highest RTP percentages. Each casino has been independently tested and offers many high-paying slots. Take a look at the list below and find the perfect casino for you!