Best Payout Slots | Play Games At The UK’s Best Online Slots Sites

Play at the top-rated online casinos in the UK

Looking for the best slot sites? Our guide covers the UK's top online slots websites, looking at the games, bonuses, payouts & much more.

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Best Payout Slots Sites

Slots are the most popular casino games, with some online casinos offering a choice of over 500 slots. With so many options, it’s crucial you know what the best payout slots sites are – otherwise, you might pick one with low odds of you winning! 

This guide gives you all the information you need to select a slots site that gives you a good chance of winning, along with providing tips on how to play games at your chosen casinos. 

How we review the best payout slots sites has an industry-leading process that covers all of the important details of the top gambling sites. 

We assess everything you care about when you visit an online casino, which means our reviews look at all of the following things: 

  • Games

  • Bonuses 

  • Payouts 

  • Deposits 

  • Withdrawals 

  • Security 

  • Mobile 

These are just some of the key details we cover in our reviews. To discover all the things we look at and the depth we go into, head over to our online casino reviews page now. 

Meet the team of gambling experts

Every piece of content on our website is written by a team of gambling industry experts. 

Our experts are casino gaming enthusiasts, sports betting fans and gambling specialists who have years of industry experience. 

But what makes our team such an asset to you is that they’re players, just like you. Our experts play the games they assess, place wagers on the sports betting sites they cover and use the online casinos they review. 

Because our experts are players themselves, our team wants you to have the best possible gambling experience and this means they provide you with reviews that are fair and accurate — they highlight the pros and the cons of every site they look at. 

It’s this commitment to their fellow players that means you can trust all of the reviews you find at  

Best payout slots games you can play at casino sites 

Games are the reason you visit slots sites. Games are what give you a fun gambling experience, a test of your ability to use betting strategies and a chance to win some cash.

While you should always pick the games you play based on how much fun they can bring you, every player knows that it’s not a lot of fun if you don’t win as much as you’d hope to. 

This is why it makes sense to look for slots games with high payouts, as the higher the payout the greater your chances of having a winning session. 

With both payout rate and fun in mind, we think that these are the five best slots games you can play at casino sites: 

  • Thunderstruck II: payout rate of 96.7%. 

  • Invisible Man: payout rate of 96.4%. 

  • Book of Dead: payout rate of 96.2%.

  • Starburst: payout rate of 96.1%. 

  • Bees Kneez: payout rate of 95.3%. 

Bonuses you can use when you play slots games 

Bonuses can really add to your gambling experience. Bonuses offer you an opportunity to earn some free plays on your favourite games, top up your casino account or boost the deposits you make. 

All of the best online casinos offer bonuses but it can be tricky for players (especially new ones) to know which rewards to look for when thinking about the ones to use on their favourite slot games. That’s where we come in. 

Below, we’ve highlighted the main bonuses you can use when you play slots games: 

Free spins 

Free spins are the main bonus you should look for as a fan of slots gaming. Free spins give you the chance to earn some free plays on leading slots games. 

Welcome bonuses 

Welcome bonuses are specifically for new players. They’re often cash offers but can also be for free spins too. The key is that you can only get a welcome bonus when you sign up to a casino site. 

No deposit bonuses 

No deposit bonuses might be the most generous bonus available to slots fans. These rewards are for either spins or cash. The thing that makes a no deposit bonus so impressive is that you don’t need to invest your own money to withdraw the winnings you make from it. 

How slot machine payouts are calculated by RNGs

Some gamblers worry that slot machines are rigged by casinos. However, all slot machines nowadays contain a random number generator (RNG)  

An RNG is a microcomputer that constantly spits out numbers, even when it’s not being used. The random numbers that are chosen each time correspond with the position of a slot machine’s reels. 

When you push the spin button or pull the handle, the spinning wheels don’t actually have an effect on whether you win or lose, which happens merely for your entertainment. The push of the button simply tells the slot machine to show you the random number generated reel positions.

This means that each payout on a slot machine, whether in a land-based casino or an online casino, is determined at random  – so you’ve no need to worry about the slot machine at your favourite casino being rigged. 

How do casinos control slot machine payouts?

Slot machine payouts are determined by an RNG, and the RNG computer chips are all programmed to pay out at a certain rate. In the US, slot machines must pay out at a minimum of 75%; in the UK there is no legal minimum payout, only an obligation to display the payout somewhere on the machine. The casino can change the chip that controls the payout rate, but they are required by law to report any of these types of changes to their country or state’s Gaming Commission.

Almost all slot machines have a minimum and maximum bet, with wagers in between often allowed too. One way that casinos control slot machine payouts is by only making the jackpot (the highest payout you can get) available to gamblers who make the maximum bet. 

The maximum bet is often incorporated into the slot machine by a ‘Max Bet’ button that automatically makes the highest wager allowed. 

The above is important to understand as it debunks some old fashioned assumptions about slots. It is as random as the roulette wheel, each play being independent. All the action is decided by the precise moment that you push the spin button or pull the handle that selects a set of random numbers. If you would have pushed the button or pulled the handle a split second later, it would have produced a totally different result.

How do I find the payout percentage on a slot machine?

To find the payout percentage of a slot machine, you need to locate the return to player (RTP). RTP is the amount of money that gamblers win back from casino games over time. Here’s how that works – if a slot machine has an RTP of 99% then it means £99 of every £100 spent goes back to gamblers, meaning that the casino makes a profit of £1. 

Finding the RTP of a slot machine is important because it tells you how likely you are to win when gambling at it – picking one with a low RTP means that you have lower odds (in the long run) of winning. 

While locating the RTP for land-based casinos can be tricky, many online casinos are obliged to publish the RTP of their slot machines – whether they have to or not depends on which organisation they are regulated by. Below we give an example of how you can find the payout percentage on a slot machine for a top-rated online casino.  

Bet365 is one of the UK’s most highly regarded online casinos. It’s renowned for sports betting but has a range of slot games. In keeping with gambling regulations, Bet365 publishes the RTP of every slot machine that you can play on its website. To find the RTP of the slots on offer from Bet365, all you have to do is search “bet365 slots rtp.” This then takes you to Bet365’s Fair Payouts page, where you can see the RTP of its slot games. 

While not every online casino makes it as simple as Bet365 to locate the RTP of its slot machines, many do make it easy to find the payout percentage. 

Of course, if you can’t easily find the payout for a casino’s slot machines, then you should take this as a warning sign – as many casinos are obliged to publish their RTP, if one makes it difficult for you to find, then you might take it as evidence that it offers an uncompetitive RTP. 

Payout rates at land machines versus those at online slots 

We made the point earlier that it can be tricky to establish the payout rate for the slot machines of a land-based casino. The simple reason for this is that not all land casinos are required to list their RTP (UK land casinos are obliged to clearly display the RTP, however, this may not be the case if you play in casinos outside the UK) while many online casinos have a legal obligation to. 

What land casinos have to do is to provide reports to their regulator which show the average payout percentage for their slot machines – this is calculated per coin denomination. The regulator then publishes this information independently of the land casino(s). 

Although the RTP for land casinos are available for gamblers to see (in theory, at least), finding this information can be tricky. When comparing the two types of casino, you may be getting a better payout rate from a land machine than an online slot — or you may not. But the chances are you won’t know the answer to that without really working for it. 

Online casino slot machines with the best payout rates 

While many online casinos offer slot machine payout rates of around 95-98%, the best way of knowing which casinos have the best payout rates is by reading reviews published by reputable sites. 

Online Casinos has written extensively on slot machines, from the rules of playing them to the history of the machines. In our reviews of the UK’s very best online casinos, we look at the different RTPs of the slot machines on offer to gamblers. By checking our reviews section, you’ll find out which online casino slot machines currently have the best payout rates. 

5 key truths behind slot machine payout rates 

There are a lot of myths about slot machines. To help you separate the fact from the fiction, we’ve listed some of the important truths about slot machines below. Warning: They won’t all be things you want to hear! 

Slot Machine Payout Rate – Truth Number 1

A slot machine, including online slots, is never “due to hit”. The payback % and win frequency can only be calculated in the long term.

Slot Machine Payout Rate – Truth Number 2

A machine, including online slot machines, can sometimes go for days on end without one single decent payout.  On the other hand, there is no reason why it can’t have 2 big payouts in a short period of time.

Slot Machine Payout Rate – Truth Number 3

It is not true that playing faster will increase your winning chances. The RNG will keep producing hundreds or thousands of numbers in between the spins of even the quickest gamer. The only reason that faster players seem to win more, is that they have made more spins. 

Slot Machine Payout Rate – Truth Number 4

You cannot affect the number generation by the number of coins you play.

Slot Machine Payout Rate – Truth Number 5

It is not true that there is any difference in the results, whether you press the “Spin” button or pull the handle.

Pros & cons of playing at high payout slots sites 

Playing games at high payout slots can be great for players. Your chances of winning are increased and that’s something every player can get on board with. 

But it’s not all upsides when it comes to slot titles with a higher payout, which is why we’ve listed both the pros and cons below of using sites that offer these games: 


  • Your chances of winning are increased 

  • Winning is (of course) more fun than losing 

  • You can get a better return on your bets


  • Your temptation to play casino games rises 

  • Responsible gambling becomes a greater priority

  • You need to manage your bankroll carefully   

High payout online casinos with the best slot games  

We review the best online casinos, looking at a range of different factors when deciding which ones we like and which ones we don’t. 

Payouts are one of the key things we look for in our reviews and these are the high payout online casinos that we think offer the best slots games. 

Dream Vegas Casino

Dream Vegas Casino is one of the top gambling sites for slot fans

Credit: Dream Vegas Casino

With a higher-end RTP of 99.00%, Dream Vegas Casino is an outstanding option for slots fans looking for a site that offers games with a high payout. Play here and you have a great chance of having a winning session. 

These are the three finest things about Dream Vegas Casino: 

  • Enormous variety of video slots 

  • Brilliant customer support team 

  • Very user-friendly website 

Casino rating: ⭐⭐⭐⭐⭐

Cast your eye over our Dream Vegas Casino review to learn more about this site. 

Genesis Casino

Genesis Casino is one of the top gambling sites for slot fans

Credit: Genesis Casino 

Great games? Check. Competitive payouts? Yep. Bonuses for slots fans? You bet! Genesis Casino is a sensational all-rounder for slots gaming, with all of the things you care about ticked off and covered in a great way. 

These are the three things you’ll like most about Genesis Casino: 

  • Plenty of jackpot slots to try your hand at

  • Often has a slots bonus for new players 

  • Loads of new slots titles for you to play 

Casino rating: ⭐⭐⭐⭐⭐

Read our Genesis Casino review to discover all the other ace things about this site.

Mansion Casino

Mansion Casino is one of the top gambling sites for slot fans

Credit: Mansion Casino 

You need to know the online casino you’re betting at has your best interests at heart and that’s certainly the case with Mansion Casino. It won ‘Best Customer Service Company’ at The International Gaming Awards2020, so you know it really cares about its players.  

These are the three things you’ll most enjoy about Mansion Casino: 

  • Includes plenty of games you won’t find elsewhere 

  • Low betting limits are ideal for new players 

  • Excellent for mobile gambling 

Casino rating: ⭐⭐⭐⭐⭐

Check out our Mansion Casino review to find out what else you’ll like about this site. 

Frequently Asked Questions

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