If you're serious about online slots, you've likely wondered which games offer the best payouts. Well, we’re here to spill the beans! In this guide, we’ll explore the highest-paying slot games ever, break down the importance of RTP (Return to Player), and share tips to help you maximise your chances of winning big. Get ready to unlock the secrets of high payouts and big rewards!

What is RTP?

Online slot games can differ significantly in terms of payouts, volatility, and bonus features. Some are designed for smaller, consistent wins, while others offer the chance to hit massive payouts, though less frequently. Despite these differences, every game ultimately revolves around one key metric: RTP (Return to Player).

RTP is the percentage of all wagered money that a game returns to players over time. For example, a slot with a 96% RTP will pay back £96 for every £100 wagered, on average. Games with a higher RTP are generally more player-friendly, giving you a better chance at long-term wins.

However, keep in mind that RTP is calculated over millions of spins. While you may experience short-term variations, high RTP games offer better value for your money in the long run. Now, let’s take a look at the highest-paying online slots!

Top 10 Highest Paying Slot Games of All Time

Let’s get down to business: the top 10 slot games with the best payouts. These titles not only offer impressive RTP percentages but also deliver exciting gameplay and thrilling features, making them fan favorites for good reason.

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1. Mega Joker – RTP: 99%

Released: 2011
Developer: NetEnt
Mega Joker is a classic fruit machine-style slot that’s beloved by players chasing high returns. Its standout feature, the Supermeter mode, is the key to its jaw-dropping 99% RTP. Though simple in design, with a retro 3x3 reel setup, this game offers massive payout potential for those who max out their bets.

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2. Ugga Bugga – RTP: 99.07%

Released: 2006
Developer: Playtech
Ugga Bugga is a unique slot that breaks away from traditional spinning reels, offering two rounds of play and the option to hold symbols between spins. This strategic element, paired with its quirky tribal theme, has earned Ugga Bugga its place among the highest-paying slots.

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3. Jackpot 6000 – RTP: 98.8%

Released: 2014
Developer: NetEnt
Another NetEnt classic, Jackpot 6000 offers a retro 3-reel, 5-payline layout. With high variance and the Supermeter mode, this slot promises bigger, though less frequent, wins. The nostalgic design transports players back to the days of land-based casinos, all while offering one of the highest RTPs around.

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4. Blood Suckers – RTP: 98%

Released: 2013
Developer: NetEnt
A gothic horror favourite, Blood Suckers pairs its vampire theme with a high RTP and exciting bonus features. This 5-reel, 25-payline slot is packed with free spins and bonus rounds, making it perfect for players who enjoy frequent wins and spooky atmospheres.

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5. 1429 Uncharted Seas – RTP: 98.6%

Released: 2014
Developer: Thunderkick
Featuring stunning visuals inspired by antique maritime maps, 1429 Uncharted Seas is more than just a pretty game. With expanding wilds and free spins, this slot delivers on both gameplay and payout potential, all while boasting a solid 98.6% RTP.

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6. Ooh Aah Dracula – RTP: 99%

Released: 2015
Developer: Barcrest
Ooh Aah Dracula may have a whimsical name, but its 99% RTP is no joke—especially when playing in High Roller mode. With free spins and a Graveyard Bonus, this playful yet eerie slot offers plenty of chances to win big.

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7. Goblin’s Cave – RTP: 99.32%

Released: 2012
Developer: Playtech
Goblin’s Cave is a simple 3-reel, 3-payline slot with a strategic twist. Players can hold symbols between spins, allowing for more control over the outcome. Its quirky goblin theme and an RTP of 99.32% make this a player favorite for big payouts.

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8. Starmania – RTP: 97.87%

Released: 2015
Developer: NextGen Gaming
With its celestial visuals and immersive soundtrack, Starmania is not only beautiful but also rewarding. Its competitive 97.87% RTP, combined with free spins and stacked wilds, makes it ideal for players who enjoy steady, smaller wins.

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9. Kings of Chicago – RTP: 97.8%

Released: 2011
Developer: NetEnt
Kings of Chicago offers a unique blend of poker and slot mechanics. Instead of the usual symbols, players see playing cards, with winning combinations based on poker hands. This unconventional format, paired with a 97.8% RTP, has made it a hit with fans of both slots and poker.

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10. White Rabbit Megaways – RTP: 97.72%

Released: 2017
Developer: Big Time Gaming
Inspired by Alice in Wonderland, White Rabbit Megaways takes players on a whimsical adventure with up to 248,832 ways to win. With free spins, expanding reels, and a 97.72% RTP, it’s one of the most innovative and rewarding Megaways slots on the market.

Highest Paying Online Casino Games

While some slots certainly offer impressive RTP, many well-established casino games offer even higher payout potential - if you know what you’re doing of course.

Blackjack (RTP: 99.5%)
A staple of any casino, blackjack is known for offering players one of the best chances to win. With optimal strategy, players can expect a return of 99.5%, making it the king of table games when it comes to payout potential.
Baccarat (RTP: 98.94%)
Baccarat is another popular table game with a high RTP, especially when betting on the banker’s hand. With simple rules and fast-paced gameplay, it’s a favourite among high rollers.
European Roulette (RTP: 97.3%)
Offering a higher RTP than its American counterpart, European Roulette is a classic casino game where strategic bets can lead to impressive returns. The absence of the double zero makes a significant difference in the odds.
Jacks or Better Video Poker (RTP: 99.54%)
Video poker enthusiasts flock to Jacks or Better for its high RTP. With the right strategy, this game can rival even the best-paying slot machines in terms of potential returns.
Craps (RTP: 98.64%)
While craps might seem intimidating at first, it’s actually one of the best games in terms of RTP. Certain bets, like the Pass Line and Come bets, offer great odds and a high return rate.

How to Find the Best Payout Online Casinos in the UK

Now that we’ve gone over the highest paying games out there, you might be wondering how you can start playing these games, and where you can find more high-paying slots and casino games. To maximise your chances of winning, you need to find the best-paying casinos. But where do you start? Here are three simple ways:

1. Check Our Online Casino Reviews

Our expert reviews offer deep dives into the payout rates and game selections of top UK casinos. Whether it's about fast payouts, high RTP games, or the reliability of customer service, our reviews guide you to the best options.

2. Check the Game RTPs

Not all slots are created equal. The best casinos will provide clear RTP percentages for each slot game, giving you transparency on what to expect. Look for games with an RTP of 96% or higher, as they generally provide better returns.

3. Check the Terms and Conditions

Terms and conditions can have a big impact on how easily you can withdraw your winnings. Some casinos place restrictions on withdrawals from bonuses or have higher wagering requirements. Always read the fine print before you begin.

How to Register and Play High RTP Slots

The first step to enjoy these high RTP games is to find a reputable online casino. Here's how you can get started:

Choose a Reputable Casino: Start with our recommended UK casinos, known for their fair play and generous payouts.
Sign Up: Register for an account by providing the necessary details and verifying your identity.
Deposit Funds: Make your first deposit using secure payment methods like debit cards or e-wallets.
Search for High RTP Slots: Navigate to the slots section, and look for games with high RTPs like the ones listed above.
Start Playing: Once you're set-up, you can begin playing your chosen game. Don’t forget to check for bonuses!

What Are Loose Slots?

"Loose slots" refer to slot machines or games that are known to pay out frequently. While there’s no official "loose slot" certification, many players consider high RTP slots or those that have a reputation for regular payouts as "loose." These games can vary from casino to casino, so it’s always worth reading reviews and doing a bit of research to find them.

What Bonuses Are Available for High RTP Slots?

Bonuses can significantly increase your chances of winning. Here are some common types of bonuses you might encounter when playing high RTP slots:

Welcome Bonuses: Many casinos offer welcome bonuses to new players. This might include bonus cash or free spins that you can use on slots.
Free Spins: Often given as part of a welcome package or regular promotion, free spins can be used on certain slot games.
Reload Bonuses: Some casinos offer reload bonuses to existing players, giving you extra cash to play with when you top up your account.

Be sure to check the terms and conditions for each bonus to understand any wagering requirements.

Top 5 Tips for Playing Slots with High RTP

Choose Games with High RTP: Always opt for slots with RTP percentages of 96% or higher. The higher the RTP, the better your long-term chances of winning.
Play at Reputable Casinos: Play at licensed and regulated casinos that offer fair payouts and secure transactions.
Take Advantage of Casino Bonuses: Use bonuses to extend your playtime and increase your chances of winning. Just remember to check the terms!
Try Free Play First: Many casinos offer demo versions of slots, allowing you to try out the game before wagering real money.
Manage Your Bankroll: Set a budget before you start playing and stick to it. This will help you gamble responsibly and ensure fun without overspending.

Maximising Winning Potential

Choose Games with High RTP

It’s simple: the higher the RTP, the better your long-term chances of winning. Always prioritise games with RTPs above 96%.

Take Advantage of Casino Bonuses (Responsibly)

Bonuses can extend your playtime and give you extra chances to win but always read the terms and conditions to understand the wagering requirements.

Remember to Gamble Responsibly

Always set limits on your time and money when gambling. If the fun stops, stop playing. Responsible gambling ensures that you enjoy the experience without stress.

Top-Rated UK Casinos with High Payouts

Looking for the best casinos to play high RTP slots? Here’s a quick rundown of some of the top-rated UK casinos known for offering great payouts:

1. Betgrouse

Betgrouse is all about high RTP slots, making it a solid choice for anyone who wants to maximize their chances of winning. Whether you're a seasoned player or just getting started, Betgrouse offers an easy-to-navigate platform packed with games from top developers like Play’n GO and NetEnt. Plus, with secure payment options and regular promotions, Betgrouse ensures you get value for your money while enjoying smooth, fast withdrawals.

2. Swift Casino

As the name suggests, Swift Casino is all about speed. From its fast payouts to its quick-loading games, this platform is perfect for players who want instant gratification. You’ll find high RTP slots from industry giants like Microgaming and Playtech, offering titles like Thunderstruck II and Book of Dead, both known for their high payout rates. Add in a fantastic loyalty program, and you’re all set to enjoy long-term rewards as you play. It's a top pick for those who love quick wins and high returns.

3. Yeti Casino

Yeti Casino delivers a well-rounded experience with a massive game library that includes slots, live dealer games, and table classics. Their high RTP games, such as Blood Suckers (with an RTP of 98%) and 1429 Uncharted Seas (98.6% RTP), are perfect for those chasing bigger wins. Yeti is also loved for its generous welcome bonuses and fast withdrawals, making it a go-to option for players who appreciate transparency and a smooth gaming experience. Plus, the 24/7 customer support ensures you’re always covered if you run into any issues.

4. Online Casino London

Looking for a mix of modern and classic slots? Online Casino London delivers with a vast selection of high-paying games. It’s especially popular for its progressive jackpots, where you can hit life-changing wins on titles like Mega Moolah. The overall RTP rates are solid, and their mobile platform is smooth and intuitive, making it easy to play your favorite games on the go. Whether you're at home or commuting, Online Casino London has you covered with a seamless experience.

5. Zetbet

Zetbet might focus heavily on sports betting, but don’t let that fool you—their slot selection is top-tier. With high RTP slots from providers like Pragmatic Play and Red Tiger Gaming, you’re in for some serious gaming action. Slots like Wolf Gold and Dragon’s Luck offer impressive returns, and consistent payouts make this a reliable choice for players who want solid rewards. Plus, Zetbet’s bonuses and promotions keep things exciting whether you're new or a seasoned player.

6. Regent Play

If you’re after a bit of luxury, Regent Play has you covered. With a sleek design and a wide selection of high-paying slots, it’s perfect for both high rollers and casual players. Slots like Gonzo’s Quest and Jack and the Beanstalk are not only entertaining but also come with high RTP rates. Regent zPlay’s VIP program is well-regarded, offering personalised bonuses and exclusive rewards, while their reliable customer service ensures a smooth and enjoyable gaming experience.

7. HeySpin

HeySpin has earned a reputation for being fast and reliable, particularly when it comes to withdrawals. The platform offers a range of high RTP slots, including titles like Mega Joker (RTP: 99%) and Starmania (RTP: 97.87%). Whether you’re into slots or live casino games, HeySpin has something for everyone. Their regular bonuses and promotions keep things fresh, and with a focus on player satisfaction, you’re sure to get plenty of value from this casino.

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