Best Online Slots Casinos and Games in the UK 2025
You can hit the reels on thousands of fun and exciting slot games when you join UK casinos. From the most popular slots online to progressive jackpots offering the biggest multi-million pound top prizes, we have everything you need to enjoy the best slots at our highest-rated casino sites.
Our expert slots guide covers:
- The most generous free spins and welcome bonuses for slots fans
- The different slot types and themes available at UK casinos
- Tips on how to find popular slot games for real money
Top Online Slot Sites for UK Players June 2025
Your Expert Guide to Playing Online Slots for Real Money
Slots are the most popular games you can play at UK online casinos. Research released by YouGov in November 2024 revealed that of all gamblers in the UK, 16% (or nearly 1 in 6) had played online slots in the previous month.
There are many reasons why slots at real money casino sites attract lots of players. They’re simple to play and don’t require you to learn any betting strategies, come in a wide range of themes and types to suit all interests and budgets, and often feature exciting bonuses such as wilds, multipliers and free spins.
Perhaps more importantly, slots offer the chance to win considerably larger amounts of money than other traditional casino games. Top prizes often reach thousands of times your bet or multi-figure progressive jackpots that can make lucky winners millionaires.
Play 2,000+ Online Slots at Luna Casino
Luna Casino has one of the largest slots libraries of any online casino, boasting over 2,000 games from 25+ leading providers like Play’n GO and Big Time Gaming. You’ll also find a massive collection of 500+ progressive jackpots, including popular releases with seven-figure top prizes such as the Age of Gods series and Eye of Horus Jackpot King.
Slots Expert - Jon Young: “My favourite slots at Luna Casino include the exclusive Thor: The Trials of Asgard. It has a huge max win of 50,000x your bet, 1,024 paylines and in-game bonuses including free spins that multiply your winnings by up to 10x.”
Player Review – Mancini Debra (Apple App Store): “I enjoy playing at Luna. It has just the right kind of games with amazing variety for slots, and I saw some new titles which were missing in other casinos.”
Sign up at Luna CasinoTop 5 Most Popular Online Slots at UK Casinos
If you’re not sure which slot games you should start with, you can see the most played online slots across over 160 UK real money casino sites in June 2025 below:
| Rank | Slot | Max. Win | RTP | Available at |
| 🥇 | Big Bass Splash | 5,000x | 96.71% | LeoVegas |
| 🥈 | Book of Dead | 5,000x | 96.21% | Duelz |
| 🥉 | Starburst | 500x | 96.09% | Dream Vegas |
| #4 | Gold Cash Free Spins | 2,500x | 95.00% | 888 Casino |
| #5 | Gold Blitz | 5,000x | 96.00% | Neptune Play |
Big Bass Splash – Pragmatic Play
Book of Dead – Play’n GO
Starburst – NetEnt
Gold Cash Free Spins – Inspired Gaming
Gold Blitz – Fortune Factory Studios
Pro tip from Jon Young, Slots Expert: “The gamble feature is what keeps me coming back to Book of Dead. You can either guess the colour of a random playing card to double your payout, or choose the right suit to boost it by 4x. That means you only need three correct guesses in a row to potentially multiply your initial winnings by a massive 64x!”
Types of Online Slot Games
Top slots casinos in the UK let you hit the reels on thousands of games, but the vast majority fall under one of several common types. Here are the sorts of slots you can expect to find at our top-rated casinos:
New Slots
Progressive Jackpot Slots
Megaways Slots
Highest Multiplier Slots
High RTP Slots
Bonus Buy Slots
June 2025 Slot of the Month: Kong 3 Even Bigger Bonus
Blueprint Gaming’s beloved Kong series returns for its third instalment with Kong 3 Even Bigger Bonus, a jungle-themed slot boasting 4,096 ways to win and a huge top payout of 10,000x your bet! You can play this 2025 release at several of our top-rated online casinos, including MagicRed, All British Casino and Betano.
The game is packed with exciting features, including four win modifiers such as the Win Streak and Win Blast, and free spins during which you can boost a progressive multiplier of up to 15x. If that wasn’t enough, there’s also four fixed jackpots, led by the eye-catching Mega Jackpot.
Slots Expert – Jon Young: “I’d rate Kong 3 Even Bigger Bonus as better than the brilliant Kong Cash Even Bigger Bananas 2, and it has deservedly become a popular slot with UK players. The range of in-game bonuses and medium to high volatility ensures excitement on every spin, as well as the chance to add numerous win modifiers to the reels as you play.”
Info & Stats
Kong 3 Even Bigger Bonus Quick Facts
Popular Online Slot Themes
Certain themes have proved consistently popular with UK slots players over the years, leading to the release of dozens of slot games set within a specific time period or part of the world:
Animal Slots
Wild West Slots
Irish Slots
Ancient Egypt Slots
Top 5 Online Slots with Highest RTP
While you can’t guarantee winning spins when you play online slots, you can take advantage of the best win rates and expected returns on high RTP games. Here are the top five slots with the best RTP rates at UK casino sites:
| Rank | Slot | RTP | Max. Win | Available at |
| 🥇 | Book of 99 | 99.00% | 5,000x | LeoVegas |
| 🥈 | Mega Joker | 99.00% | 2,000x | Luna Casino |
| 🥉 | Treasure of Tengshe | 98.94% | 4,190x | Coral |
| #4 | Jackpot 6000 | 98.90% | 6,000x | All British Casino |
| #5 | Gold Digger: Mines | 98.88% | 8,230x | 888 Casino |
Pro tip from Jon Young, Slots Expert: “Another brilliant addition to Relax Gaming’s ‘Book of’ series, the ancient Greece-themed Book of 99 boasts a very high 99% RTP. There’s also bonus rounds with expanding symbols and high volatility, meaning you can look forward to bigger payouts when they do land. With a upper bet of £100 per spin and max win of 5,000x your stake, high rollers can play for the chance to win up to £500,000.”
Top Tips for Choosing Your Perfect Online Slot
There are several things you can do to ensure you have a fun casino slots experience. Follow our tips to help find the most enjoyable online slot machines for you:
Try free slots first: You can play free slots to try out games and see if you like them without needing to risk your cash. This is also a good way to learn more about how a slot and its features work, so you know exactly what to expect from the reels when you play for real money. Many UK casinos allow you to play free casino games including slots.
Test your favourite slots on mobile: If you regularly play at mobile casinos, we suggest checking out top mobile slots to enjoy games that are optimised for your smartphone. These days, software providers produce slots using HTML5 technology, meaning they load quickly and run with high-quality graphics on mobile gambling sites and casino apps.
Consider the RTP: All online slot games have a RTP rate, which dictates how many money the slot will pay out from £100 worth of bets on average. That means you can play slots with a higher RTP above the 96% standard to get expected better returns.
However, it’s also important to note that some slots (such as Big Bass Splash and Blood Suckers Megaways) have different versions with varying RTPs and may allow the casino to set the RTP. Therefore, you should check this information for a slot at a casino if it’s provided to ensure you’re getting a favourable RTP percentage.
Take advantage of free spins and slots bonuses: There are numerous casino bonuses you can claim to get extra chances to win at online slots. Dozens of top UK casinos offer free spins promotions, both as welcome bonuses for new players and reload promotions if you already have an account.
Some casinos even have no deposit free spins that offer the chance to win real money playing slot games without needing to deposit any money whatsoever.
Pro tip from Jon Young, Slots Expert: “Something I like to do is check websites for software providers to see if there any upcoming slots being released in series that I like. Often, they will provide information such as the theme, RTP, max win and volatility for a slot before you can play it at casinos, meaning I’ll already know if I’m likely to enjoy it by the time it’s available.”
Why Should You Only Play Regulated Online Slots?
Every time you play online slots, you should ensure you’re using casino sites licensed by the Gambling Commission (UKGC). These casinos only have games from the UKGC’s register of approved software providers, which have been tested and regulated as producing slots that use reliable RNG technology.
However, non-UKGC casinos can clone and advertise slot games from approved providers in order to appear legit, which can make it tricky to tell if an online casino is safe. That’s why to help you out, Casino.co.uk only features UKGC-licensed casinos that provide trustworthy gambling platforms.
Top Online Slot Game Providers
There are numerous software providers that produce slot games, which is part of the reason why there are so many to choose from at online casinos and new slots are released on an almost daily basis. All of the providers at licensed casino sites are also UKGC-approved, meaning their games have been tested and verified as using fair RNG technology.
Our in-depth guides to top slots providers cover the best games they have produced, which casinos you can play them at and why their slots are popular with UK gamblers.
Apricot (formerly Microgaming) has produced 5,300+ games across over 30 years, including Immortal Romance and Mega Moolah.
Playtech are slots specialists with games boasting unique features and high-quality graphics. They also produce table and live casino games.
Amaya’s games portfolio spans more than 300 games, giving players flexibility across slots, poker games, sports betting and much more.
Aristocrat has released slots for online casinos in over 90 countries. Its popular releases include Queen of the Nile and Sons of Anarchy.
Few software companies match Betsoft for games variety, having produced slots, table titles, video poker, virtual sports and scratch cards.
IGT’s diverse and ever-growing portfolio of 550+ games includes titles with huge top prizes and wide betting limits to suit all budgets.
Novomatic is an innovative casino software provider with decades of experience in producing games such as Book of Ra: Magic.
Slots fans have likely played a NetEnt release. The range of over 200 titles includes high RTP games such as Gonzo’s Quest and Mega Joker.
Frequently Asked Questions
How do you win at online slots?
Online slots are games of chance, so there’s no way that you can guarantee a winning payout on any spin. However, by playing slot games with an RTP above the 96% average and lower volatility, you can expect to win more money over the long term and land more frequent payouts.
Are online slots rigged at UK casinos?
No, so long as you’re playing slot games at UKGC-licensed online casinos. These are provided by approved software producers and use random number generators (RNG) which have been independently tested and approved by companies such as eCOGRA and iTech Labs as providing fair and unbiased outcomes.
When is the best time to play online slots?
Simply whenever it most suits you to play slots online. The time of day you play games has no impact on your chances of winning real money, as every spin is random and prizes such as progressive jackpots can be traiggered at any time.
How you can win big at online slots at UK casinos?
To improve your odds of landing larger payouts, you can place bigger bets on every spin and play high volatility slots, which tend to pay out less often but are more likely award big wins as a result. However, you should still gamble responsibly and consider your budget with every slot game you play.
What online slots pay real money?
Any online slot at our featured casinos will pay out cash if you place a real money bet on the game and land a winning spin. On most slot types, winning combinations involve three or more matching symbols on the same payline.
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