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Best Online Casino Slots – Most Popular Slot Games To Play

best online slots

Do you want to know what the best and most popular online slot games are? Well, you’ve come to the right place! Here, at King Casino, we offer players the chance to play 1,000+ online UK casino games and slots, but which ones are considered to be the best or most popular?

Today, we will provide you with all the information you need on the best UK online casino slots. We’ll also discuss several of the best online casino slots, best online casino slots by their Return to Player (RTP) rates, and more. Keep reading to find out all you need to know!

Best Online Casino Slots UK 

Let’s start by looking at some of the best online casino slots in the UK. Many slots exist, but the ones that made the cut for us are:

  • Moon Shadow

This online slot game was developed by Barcrest and boasts an incredible RTP of 98.1%. The developer is trustworthy, and this game has several features that may help maximise prospective winnings. 

  • Queen of Riches 

Queen of Riches is an online slot game with a unique layout and a great RTP of 96.9%. This slot is known to have a high volatility meaning that, theoretically, wins may not be too frequent, but if you do manage to land a win, it could be of significant value. 

  • Frozen Inferno

Frozen Inferno is a Hell-themed slot known to have a RTP of 96.36%. It features 40 paylines and has symbols such as skulls, potions, fire, and more! This slot can certainly keep you interested with its graphics and effects.

  • Jackpot 6000

Jackpot 6000 is an entertaining online slot that features a 98.9% RTP. It’s known to be one of the classic slots and gives the experience of using a typical land-based slot machine. The Jackpot 6000 slot gives the impression of being in a real-life casino, and it also offers you the chance to potentially win the top Jackpot prize

  • Fortunes of Sparta

Fortunes of Sparta is one of the greatest graphic adventures available in slot games. It features warriors, beautiful goddesses and ancient Greek vases set on a golden background. This slot was developed by Blueprint Gaming and aims to bring the Spartacus world to players in the UK. 

  • The Equaliser 

An online slot launched by Red Tiger Gaming, The Equaliser offers several expanding reels, extra spins, and a possible top win up to 10,000x your stake. This game is based on an arcade game by the same name. 

  • Phoenix Sun

This online slot was developed by Quickspin and features great graphics, sounds, and animations. The symbols depict ancient Egypt, and the game features a 5×3 layout with 234 paylines. 

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What are the Best Casino Slot Games? 

Are you wondering what the best casino slot games are and how you’re supposed to identify them? One of the best parts of playing online slot games is that you can be provided with information about slots beforehand, which can help you choose the best real money casino slot games for you.

This information exists in the form of the RTP percentage and volatility. The RTP value is a percentage that describes the amount an online slot may pay back to you after a certain amount of spins. For example, if a slot has a RTP of 98%, theoretically, you may possibly win £98 for every £100 wagered in the game. Do keep in mind that this number is calculated over thousands if not millions of spins, so this might not always be the case as slot machines are completely random.

The other is slots volatility, also known as variance. This illustrates how a certain slot’s RTP will be realised. For example, a low volatility slot may theoretically give frequent wins, but they could be small, whereas a high volatility slot may award less frequent wins, but they could be of a higher-paying value. 

Typically, high volatility slots can have most of their prizes located in their bonus games. The volatility of slots can be hard to calculate as many potential winning combinations may exist; hence, game providers offer descriptions such as ‘Low’ or ‘High’ volatility in this case. However, it is important to keep in mind that these figures may not always be accurate, and nothing is ever guaranteed.

Best Casino Slots by RTP 

Below is a list of slots arranged from highest to lowest in terms of RTP percentage:


RankSlot GameDeveloperRTP
1Asgardian Stones NetEnt97%
2Fire Joker Pragmatic Play 96.71%
3Legacy Of Dead Play’n GO96.58%
4Wild Rails Play’n GO96.53%
5Phoenix Reborn Play’n GO96.5%
6Doom of Egypt Play’n GO96.21%
7Hot Spin iSoftBet96.02%
8Bonanza Megaways UKBig Time Gaming 96%
9Book of Dead Play’n GO 96%
10Sails of Gold Play’n GO94.23%

The Most Trusted Online Casino for Slots 

If you’re looking for a reliable online casino to begin your slot journey, then King Casino is just the place for you! At King Casino, we provide over 1,000 top mobile games, including the latest and the most popular slots, so there’s something for everyone!

We at King Casino believe that online casinos should stay innovative and provide players with an experience that mimics a real-life casino. Hence, we provide a range of games that include live dealer games, and all of our games follow online gaming regulations under the UK Gambling Commission (UKGC). This ensures that all games are fair and secure. 

Furthermore, all of our games display the RTP and give an insight into the gameplay, minimum and maximum bets, and more!

Play the Best Online Casino Slots at King Casino 

At King Casino, we have a relatively simple registration process. You can get started by clicking the Join button and following 3 simple steps. These are:

  • Submit your information
  • Make a minimum deposit of £10
  • Start playing! 

Registered players have easy access to our wide variety of 1,000+ new online casino games. Simply select the game you want to play and get started! 

*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to these slot games are subject to change at any time.

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