Best payout slots online 🎰 May 2024

The 10 best payout slots for May

If you’re looking for slots with great graphics, bonus features, and plenty of opportunities to win big, these are the top ten slots for you.

What makes a high payout slot?

There are a few ways in which an online slot may be considered high paying. You can base it on the slot’s maximum win potential, the return to player (RTP) rate, or the jackpot figure. Not all slots offer progressive jackpots, however, so the highest RTP slots and the best payout slots are the most common.

Best RTP slots to play

We’ve rounded up our top five slots with the highest RTP rates. From a range of leading providers and with unique features, find out what makes them a great choice below.

1. Ugga Bugga – 99.07% RTP

The Ugga Bugga slot by Playtech has an unconventional layout of 10 reels, 1x3 in size. Each reel has its own payline too, so you essentially get 10 chances to land a winning combination on each spin. It also comes with a hold and spin feature and a tribal mask wild symbol. Naturally, the main attraction here is the fact it boasts an unprecedented RTP rate of 99.07%.

💡 Editor’s insight: Although Ugga Bugga tops all of the highest RTP slots lists, it’s not an attractive game. It now looks dated and, with max wins of only 1,000 x your stake, we suggest opting for another high RTP game instead.

2. Book of 99 - 99% RTP

Created by Relax Gaming, Book of 99 launched in 2021 and has an ancient Greek theme. Played over five reels with 10 paylines, the game centers around the free spins feature. As the name suggests, this uses a ‘Book of…’ mechanism, providing you with expanding symbols, unlimited retriggers, and of course, a 99% RTP rate.

💡 Editor’s insight: Book of 99 would be a playable slot even without the super RTP rate. While the graphics aren’t up to Relax Gaming’s usual standards, the slot stands out from the ‘Book of…’ crowd thanks to a collection feature. With this, you can collect wilds in the base game to trigger free spins.

3. 1429 Uncharted Seas - 98.5% RTP

One of the best-looking games on this list, 1428 Uncharted Seas by Thunderkick comes with five reels, 25 paylines, and a pirate theme. Besides a generous 98.5% RTP rate, the slot also offers expanding wilds in the base game and a free spins feature. Trigger the latter and you can grab up to 100 free games.

💡 Editor’s insight: I’m a big fan of 1429 Uncharted Seas and I love the design. Although the max wins are limited (670 x stake per spin), it’s a low variance game with a high hit frequency rate. This makes it perfect for players who want to play for longer.

4. Marching Legions - 98.12% RTP

The second Relax Gaming title on this list, Marching Legions is a Roman themed slot with quirky pixelated graphics – a little like Minecraft. Played over five reels with 243 ways to win, it also offers respins, a nudge feature, and a free spins round. The legionnaire symbol also appears stacked, which can lead to sizeable wins.

💡 Editor’s insight: With an impressive RTP rate of 98.12% and 10,000 x bet max wins, Marching Legions is one of the best payout slots around. It’s also fun and visually great, although it is quite volatile.

5. Blood Suckers - 98%

Although Blood Suckers came out way back in 2009, it’s become something of a classic. Created by NetEnt, this vampire themed title boasts five reels, 25 paylines, and two bonus features. In the Vampire Slaying bonus feature you must choose a coffin to reveal an instant cash prize, whilst the free spins round carries a 3x multiplier. This is your best chance at unlocking bigger wins.

💡 Editor’s insight: Blood Suckers is a cult slot for a reason. The 98% RTP combines with a decent max win limit, a low volatility, and a 44.9% hit rate to create a top paying online slot. Thanks to these stats, however, most US casinos don’t allow Blood Suckers wagers to contribute towards wagering requirements.

Highest paying slots by max win

As we noted earlier, you can categorize high paying slots in a number of ways. Below, we've rounded up the top five titles with staggeringly high max win amounts. Each can pay over 100,000 x your stake per spin.

1. Tombstone R.I.P - 300,000 x stake

Perhaps one of the scariest slots ever, Tombstone R.I.P offers max wins of 300,000 x your stake per spin. Created by Nolimit City, it comes with five reels, 108 paylines, and a gory Wild West theme. Bonus features include xNudge Wilds, xSplit Wilds, Reel Split Wilds, and two free spins features.

💡 Editor's Insight: Tombstone R.I.P is not for the faint-hearted, both in terms of the graphics and gameplay. The slot's volatility has been rated 'insane' by Nolimit City themselves, and some might find the gruesome murders and hangings a little gratuitous. If you're not squeamish, however, we recommend letting the carnage (and big wins) commence.

2. Starburst XXXtreme - 200,000 x stake

Based around the incredibly popular Starburst, Starburst XXXtreme ups the ante, offering 200,000 x stake max wins. Created by NetEnt, of course, the slot also comes complete with five reels, nine paylines, and Starburst Wilds with added multipliers. The bright space theme looks as appealing as ever too.

💡 Editor's insight: The key to reaching those eye-watering max wins is to land multiplier Starburst Wilds. Alone, these can carry multipliers worth up to 150x, but they also combine to reach a total multiplier of 450x.

3. Money Train 4 - 150,000 x stake

The last and the highest paying in the Money Train series, Money Train 4 is a grid slot with attitude. Played on a 6x6 grid with a scatter pays mechanism, it has a high volatility, three bonus features, and you can win up to 150,000 x your stake on every spin.

💡 Editor's insight: Money Train 4 is one of the best slots I've ever played. The graphics are great and the features work together to create those huge wins. I didn't think Relax Gaming could top Money Train 3, but they have! Hats off to them.

4. San Quentin xWays - 150,000 x stake

Another Nolimit City title, San Quentin xWays is set within the prison of the same name in California. The slot has five reels, 243 regular ways to win, and uses the provider's xWays mechanism. Razor Split symbols can give you up to 13,189,257,216 ways to win too, whilst the Lockdown Spins feature offers multipliers worth up to 512x.

💡 Editor's insight: If Tombstone R.I.P gave you the heebie jeebies, then we recommend this Nolimit City title instead. The max win amount is slightly lower, but the volatility is still 'insane' and the graphics are somewhat more palatable.

5. Robin Nottingham Raiders - 121,500 x stake

Created by Peter & Sons, Robin Nottingham Raiders is a high volatility slot with five reels and 20 paylines. It has a cartoon design, in a classic Peter & Sons style, a wild symbol collection feature, and a free spins round. To achieve the max win of 121,500 x your total stake, you need to land a screen full of wild symbols, plus a 243x multiplier.

💡 Editor's insight: With a hit frequency rate of 25.46%, wins are pretty regular despite the volatility. That said, the chances of landing the max win are 1 in 249,999,999. That's a lot of spinning.

The biggest progressive jackpot slots

Finally, some would argue that progressive jackpot titles are the best payout slot machines. This is quite simply because you can win huge amounts of money from a single spin. Discover some of the highest paying jackpot slots below.

1. Mega Moolah

Often called the "millionaire maker", Mega Moolah is a classic progressive jackpot slot by Microgaming. With a safari theme, it boasts five jackpot prizes. The highest of these is the Mega Jackpot, which seeds at $2 million and is won every 8 weeks on average.

💡 Editor's insight: Microgaming has expanded its Mega Moolah jackpot network to include over 15 slots. This means you can play slots with different themes whilst competing for the same Mega Jackpot prize.

2. Mega Fortune

Created by NetEnt, Mega Fortune is a progressive jackpot slot with a luxury theme. The trappings of wealth are a bit on the nose, but the three jackpots on offer are not to be sniffed at. The biggest seeds at $150,000 and this is typically claimed every 105 days.

💡 Editor's insight: Even if you don't manage to grab a jackpot prize, Mega Fortune has a decent math model. With a low volatility, a 96.6% RTP rate, and 2,162 x stake regular wins, it's still worth a spin.

3. Age of the Gods

Created by Playtech in 2016, Age of the Gods is still an exciting progressive jackpot title. With 4 reels and 20 paylines, the jackpot round is triggered randomly but, once in, you're guaranteed a prize. The Ultimate Power jackpot is the one you want, seeding at $100,000.

💡 Editor's insight: Although Playtech now boasts a wide range of Age of the Gods slots, I still find the original title the best. The graphics look a little tired, but there's max regular wins of 50,000 x your stake to aim for too.

New and upcoming high payout slots

As software providers are always releasing new slots, we've searched high and low for the best paying slots of 2024. Below, you can find newly released high RTP slots and progressive jackpots, as well as upcoming releases from our favourite providers.

• Fire in the Hole 2 by Nolimit City (65,000 x bet max wins)
• Kenneth Must Die by Nolimit City (69,000 x bet max wins)
• Space Miners Dream Drop by Relax Gaming (Progressive jackpot)
• Trigger Happy by Big Time Gaming (50,000 x bet max wins)
• Colt Lightning Firestorm by Play'n GO (50,000 x bet max wins)
• Sugar Rush 1000 by Pragmatic Play (97.5% RTP)
• Cash Truck 3 by Quickspin (40,000 x bet max wins)
• 4 Fantastic Fish Gold Dream Drop by Relax Gaming (Progressive jackpot)
• Break Da Bank Again Mega Moolah by Games Global (Progressive jackpot)

What is RTP?

RTP, or return to player, is a key metric in the world of slot machine payouts. It represents the percentage of all wagered money that a slot will pay back to players over time.

Simply put, the higher the RTP, the better your chances of winning in the long run. For instance, a slot with an RTP of 95% will, theoretically, return $95 for every $100 wagered.

It's important to know that the RTP rate doesn't mean you will definitely get $95 back for every $100 you wager. After all, if that were true, how would US online casinos make money? RTP is a theoretical value, calculated over millions of spins.

Keep in mind that individual gaming sessions can vary widely from this average due to the randomness of slot outcomes. For instance, if you wager $100 and lose everything, your personal RTP rate is simply 0%. Winners, on the other hand, could have a personal RTP rate of 200%.

When hunting for the best slot machine payouts, you can prioritize games with higher RTPs, though this isn't the only thing to look out for. In the following sections, we look at the connection between RTP rates and other slot stats.

⚖️ RTP and volatility

An online slot's RTP and volatility are connected. Volatility measures the risk associated with playing a slot. High volatility slots tend to offer larger payouts but less frequently, while low volatility slots provide more frequent but smaller wins.

High volatility slots, therefore, are riskier as your bankroll can be swallowed up before you even land a win. That said, the payout from a single spin can be worth waiting for.

🎯 Does hit frequency matter?

Hit frequency refers to how often a slot machine pays out wins. Hit frequency rates are shown as percentages, for example 25%. A 25% hit frequency rate means that every one in four spins will be a winner.

While hit frequency may seem crucial, especially when searching for the best paying slots, it doesn’t directly impact a game’s RTP or overall profitability. This is because one sizeable win can be worth a lot more than 20 wins from another slot.

🤑 Jackpot slots and RTP

When searching for the highest payout slots, it might seem tempting to play progressive jackpot slots, due to their massive potential payouts. However, their RTPs are often much lower. This is because a portion of each wager contributes to the jackpot.

For instance, Mega Moolah has an RTP rate of 93.42%. 88.12% is for the slot without the progressive jackpot, whilst 5.3% for what you wager goes towards the progressive jackpots.

How to find high paying slots

Besides using pages such as this one, there are a few things you should pay attention to if you want to find high paying slots. Below, our experts share a few ways you can find out whether a new online slot is worth it:

• Prioritize games with generous RTPs, typically above 96%
• Always check the paytable for the maximum amounts
• Look for slots with features like progressive jackpots, lucrative bonus rounds, and high volatilities, as these tend to offer the chance for significant wins
• Keep an eye out for our reviews and recommendations to identify video slots with high payouts

High payout slots and casino bonuses

As you probably know, slot sites offer casino bonuses to new and existing players. These come with several terms and conditions, including wagering requirements.

Wagering requirements are the number of times you need to wager the bonus before you can withdraw. They're usually listed as a multiplier, e.g. 30x. If you claim a $20 bonus, therefore, you must wager $600 (20 x 30) before you can cash out.

Playing high RTP slots can make it easier to clear wagering requirements. You can wager the same amount of cash but you can expect a higher return. To avoid this, online casinos often exclude certain slots from bonuses. Blood Suckers by NetEnt is a common example.

Always read the small print before opting in for a bonus. If you know you want to play high payout slots, it might be worth not claiming the bonus altogether.

Where to play the best payout slots

So, you now know which slots are most likely to win the most, but where should you play them? At Casino.org, we've reviewed and rated hundreds, if not thousands, of US online casinos. This includes both sweepstake and real money sites.

We review all sites using our 25-step rating process, which looks at a range of criteria including slot libraries, fairness, and bonuses. With our help, you can find truly great and trustworthy slot sites.

Browse the list below to find a great slot site now, or read on to find out what we look for when rating sites.

The best US slot sites for 2024

How we find the best slot sites

Our in-depth rating process dives deep into a slot site so you don't have to. Our team registers at the site, makes a deposit, and plays the slots. We look for sites with extensive slots libraries with games from the best providers, plus fair bonuses for slots players like free spins.

The site must also be easy to use, offer an array of payment methods, and be completely mobile friendly. It's this process that allows us to guarantee these are the best slot sites for US players. Check out the importance we place in each area below.

Expert tips for playing high payout slots online

If you've got to this point of the page, chances are you're now a bit of a high payout slots expert yourself. To boost your knowledge further, always remember these top tips from our slots specialists.

• Check the RTP rate and stats

  Always look for slots with RTP percentages of 96% or higher, as these generally offer better payouts in the long run. You should also consider the hit frequency rate and the max win amount.

• Play the max bet (if possible)

  Some high payout slots offer larger payouts or progressive jackpots when you bet the maximum amount. If your budget allows it, consider playing max bet to qualify for bigger prizes

• Play demo versions first

  Most online casinos offer demo versions of their high payout slots. Take advantage of these to familiarize yourself with the game and its mechanics before risking real money. You can also play free slots here at Casino.org.

• Manage your bankroll

  Before you start playing, set a budget and stick to it. High payout slots can be enticing, but they can also eat up your bankroll quickly if you're not careful.

• Check the bonus T&Cs

  As high RTP slots might not contribute to wagering requirements, it's always important to read the small print. Make sure you can play high RTP slots with your bonus or consider avoiding the bonus in favour of playing the games you love.

• Follow jackpot trackers

  If progressive jackpots are your thing, make sure to follow online jackpot trackers. These trackers combine information from various online casinos to give you real-time updates, and historical data. They can even tell you when the jackpot is likely to drop.

• Keep your emotions out of it

  Don't let emotions dictate your gameplay. Stay calm and focused, even during winning streaks, to make rational decisions about your bets.

As an avid slots fan, my best tip is to follow software providers on social media. They usually leak details about new slots before anyone else, and can provide you with the payout data you need.

Daisy Harrison

Casino.org Editor