The Top 8 Online Slots with the Best RTP and The 8 Best RTP Online Casinos

The Most Popular Sizzling Online Slots 

Slots are a lucrative casino game that is just as easy to play as it is to win. Coupled with the tantalizing graphics, sound engineering and sensational themes, a slot machine most certainly came a long way from its former days of waiting for three cherries to line up. First, punters no longer need to go to land-based casinos to play an oversized slot machine.

Second, gamblers play slots from the convenience of their homes with the internet from their computer or smartphone. Third, a slot can be linked to a progressive jackpot. So in other words, the prize money is actually being pooled by several machines making the winnings even larger. Equally important, an online slot offers the opportunity to win big within the palm of the punter’s hand.

On the negative side, progressives slots have the lowest RTP percentages. To put it differently they’re typically often 8-10% less. Namely that percentage includes all the big progressive jackpot amounts. All in all, the RTP on the base game is even significantly lower.

Wise tip for slot gamblers, when you want to get the best playability, avoid progressive slots. Except of course for these two exceptions: 1. The progressive is at an all-time high or 2. You’re playing with bonus money.


In addition, punters need only choose the slot with the best RTP to make the most of their bet. In other words, RTP is a term that online casinos use to describe the percentage of all the wagered money a slot machine will pay back to the punters over time. This in itself explains how much money is put into the slot machine as opposed to how much is returned.

To explain further, let’s say the RTP of a slot is 93%. Now the punter can expect to get £93 back for every £100 that they’ve bet. Furthermore, the RTP is always calculated over the long term. To point out in this way, all variance, highs and lows, is evened out. Another key point, Microgaming, Netent and Thunderkick have better Return To Player percentages than other slots developers.

RTP FACT: Big name or franchised slots have a low Return To Player.

Next, specifically check the RTP of the slot. Most slots have the RTP listed in the paytables of their game. However if you cannot find the RTP, consider playing a different slot. This effectively ensures that you’ll understand how well it rates on the RTP scale. In sum, the higher the RTP, the more of an advantage the punter is at on playing that slot.

  • Low RTP: 93% or less
  • Acceptable RTP: Between 93% and 95% 
  • Great RTP: Between 95% and 97% 
  • Excellent RTP: Between 97% and 98%
  • Superb RTP: Higher than 98%



This visually amazing slot is all about expanding wilds, free spins in the bonus, stunning graphics and a superb soundtrack. As legend has it, Bork the Berzerker is looking to win back his girlfriend. He will not rest until all the unruly monsters are beaten, and your pockets are filled with coin. This highly recommended slot comes with a great name and a good RTP. 


With a payout percentage that is just as great at 97.5%, Simsalabim has lots to offer besides its RTP. For the most part, it dazzles its punters with impeccable graphics, great bonus features and free spins at 3x multiplier. Given these points as well as its scattered payouts of up to 200x your bet, Simsalabim is an online slot that’ll keep have coming back for another spin.



Thunderkick made one of the best slots around when they came up with the wild and zany Esqueleto Explosivo. Coupled with exploding skeleton heads, increasing multipliers and much more, this slot has a powerful RTP as well ensuring that it’s worth your investment. All things considered, along with the Golden Elvis symbols, complete with cool sunglasses, Esqueleto Explosivo also has huge multipliers of up to 32x!


Netent presents some real shady characters including monsters, the devil and the grim reaper in this exciting online slot, Devil’s Delight. In effect, the main bonus that’s able to pay out incredible, enormous amounts is a play-till-you-win type bonus. Thereupon, the longer a punter plays, the closer you will get to that lucrative Sin Spins bonus. As a result, three or more Zodiac symbols triggers the free spins bonus. Moreover the expanding wilds on reels 2, 3 and 4 can pay out huge wins in the base game.


Netent effectively combines video poker with a regular slot machine and developed Kings of Chicago. Rather than traditional slot symbols, there are card symbols on the reels. For a super high jackpot payout, land winning poker combinations. With this in mind, Jokers pay out double. Moreover there is an exciting free spins feature which keeps this 5 win line game very interesting to say the least. Play King of Chicago online now at Mr Green Casino

3. 1429 UNCHARTED SEAS: 98.6% RTP 

1429 Uncharted Seas is a superior slot title. One point not to be overlooked is that it has a spiffy sea exploration theme. Triggering this feature, punters receive free spins with expanding wilds and large payouts. This slot from Thunderkick comes from a Swedish game developer that’s well known in the UK gaming and gambling industry. Play your luck on the 1429 uncharted high seas at Leo Vegas Casino.

2. MEGA JOKER: UP TO 99% RTP (*Play in ‘Super’ mode*)

Offering the classic gameplay that punters love, Mega Joker features 5 win lines, mystery prizes and fruit and bell symbols. This old fashioned, classic fruit machine type slot from Netent, provides one of the highest payout ratios of all online slots. With an impressive 99% RTP, punters can play the titillating Mega Joker slot now at PlayFrank Casino.

1. MONOPOLY BIG EVENT: 99% RTP  (*Play in ‘big bet’ mode*)

A great slot from Barcrest with some especially unique features. Not including great bonuses and surprisingly, the highest return to player percentage on an online slot: 99%. To be noted, this RTP of 99% only applies when you’re playing in the big bet mode and particularly where you’ve staked £30 for five enhanced spins. On the positive side, along with an amazing RTP there’s sticky wilds, multipliers, extra wilds and spintastic free spins.


6. Ladbrokes – 97.3% RTP

  • Features top Playtech slots 
  • Launched in 2000
  • Licensed in the UK and Gibraltar
  • New mobile casino with heightened functionality
  • One of the biggest online casinos in the UK.
  • ‘big games, bigger bonuses and the biggest jackpots.’
  • Superb Ladbrokes Mobile Casino App
  • £1.6 MILLION Maximum Jackpot
  • Licensed by the Gibraltar Gambling Commissioner.

  • First 3 Deposits up to £1,500
    • First Deposit: 100% match bonus (or 150% from the installed app) up to £500
    • Second Deposit: 50% bonus of up to £500
    • Third Deposit: 125% bonus of up to £500

5. Betfred – 97.42% RTP

  • Established in 2005
  • Powered by Playtech, Ash Gaming, BossMedia, Wagerworks gaming software.
  • One of the largest online casinos and mobile gaming in the industry.
  • Themed slots fashioned after cultural icons such as Elektra slot, the Pink Panther slot, and the Incredible Hulk slot.
  • 24/7 live chat customer support availability.
  • 128-bit SSL encryption and top-notch firewall protection
  • Regulated by the UK Gambling Commission.
  • Full assortment of 3-reel, 5-reel and progressive slots.
  • Slots that are classics: Gladiator Jackpot, Piggies and the Wolf, and Full Moon Fortunes.

4. Leo Vegas – 97.43% RTP

  • Launched in 2012
  • Europe’s fastest and most user-friendly mobile casino
  • Named ‘Mobile Casino Product of the Year’ by EGR Innovation Awards in 2014, LeoVegas was also a finalist in ICE Magazine’s ‘Best Gaming Operator of the Year’ category in 2013.
  • Award-winning mobile experience
  • 7.5 € MILLION Maximum Jackpot
  • Licensed by: Malta Gaming Authority
  • Section dedicated to ‘Classic slots.’
  • Huge collection of 336 themed slot games to choose from, including titles such as ‘Go Bananas’, ‘Flux’, ‘Scarface’ and ‘Andre the Giant’. 

3. CASINO CRUISE – 97.48% RTP 

  • Founded in 2014
  • Microgaming, NetEnt, NextGen Gaming and Play’n Go software.
  • Amazing slots such as When Pigs Fly, Grim Muerto, Electric Diva or even Fire Joker.
  • 24 customer support via an online form, email, live chat or telephone. 
  • Classic slots, High Roller slots, Jackpot Slots and Video Slots.
  • Generous bonuses and promotions.
  • Mobile Gameplay through App

2. Paddy Power – 97.51%

  • Huge gambling brand in the UK
  • Launched in 2004
  • Playtech, IGT and Wagerwork gaming software.
  • eCogra certified
  • Licensed by the Alderney Gambling Control Commission
  • Video slots: including and not limited to those based on the famous superheroes of the Marvel comics, such as the Incredible Hulk slot, Iron Man 2 slot and the Gladiator Jackpot slot.
  • Mobile gaming available for iOS and Android punters.
  • 24/7 live chat customer support service.
  • State-of-the-art SSL encryption.
  • Instant Play or Download games
  • Hosts a lot of exciting slots, including progressives
  • Winner of the Casino Operator of the Year title in 2015 at the EGR Awards.
  • More than 130 slots are available in the online instant play version.

  1. Coral Casino – 97.54% RTP

  • Launched in 2012
  • NetEnt, CryptoLogic, IGT, and Electracade software.
  • Popular slots like The X Factor, Monopoly, Fantastic Four, and Iron Man and The Avengers.
  • Huge number of games from the world’s largest software platforms
  • Protected with SSL encryption
  • Great number of online video slots
  • Mobile friendly by download or instant play
  • £1.6 MILLION Maximum Jackpot
  • Licensed by the Gibraltar Gambling Commissioner.
  • Three Bonuses on the First Deposits

    • First Deposit: £50 free for £10
    • Second Deposit: £10 free for £10 for slots
    • Third Deposit: £5 free for roulette