UK Slot Bonuses 2025

Playing slots is so much fun, but it’s not cheap entertainment by any standard. In the United Kingdom, slot machines are among the most popular types of games in the gambling industry and there are hundreds of options to choose from, all with their own unique offers, perks, and deposit bonuses. We have compared the biggest and best on your behalf and narrowed it down to the best slot bonuses there are to offer in the UK. Discover the best slot bonus for you with the most generous welcome packages to new players, and how we can help you get more for your buck.

Best Slot Bonuses UK 2025

1		30 Free Spins No Deposit	888 Casino	Sign-Up	Free Spins offer: New customers with a UK/Ireland registration address; re-registered ineligible. Free Spins set at £0.10 each; claim via SMS within 48 hours and use within 14 days. valid on selected games. Full T&Cs apply Deposit offer: First-time depositors • Min deposit £10 • Claim within 48 hours • Expires in 90 days • 30X wagering • Valid on selected slots • UK and Ireland only • Full Ts&Cs apply.
2		25 Free Spins No Deposit	NetBet Casino	Sign-Up	New UK certified players only | Valid mobile number required | No deposit needed | 25 Free Spins on Starburst XXXtreme each valued at 10p | 40x wagering on Free Spins winnings | Ends 30.06.2025 | T&Cs Apply.
3		Get 200 Free Spins When You Deposit And Play £10	William Hill Vegas	Sign-Up	18+. Play Safe. New UK online customers only using promo code BBS200. Opt in required. Deposit & wager min £10 to claim 200 free spins at 10p per spin to be use on Big Bass Splash. 1x per customer. Free spins expires 72 hours from issue. Max £30 redeemable on free spin winnings. Payment methods restricted. Full T&Cs apply..
4		50 Free Spins No Deposit	Sky Vegas Casino	Sign-Up	18+ new customers only. Opt-in required. 7-day Free Spin expiry. All Free Spins will be loaded on the first eligible game selected. Game and eligibility restrictions apply. gambleaware.org. Further T&Cs apply.
5		Up to £100 Welcome Bonus	Jackpot City UK	Sign-Up	18+ New UK based customers only. You must opt in (on registration form) & deposit £20+ to qualify. Offer valid 7 days from registration. Debit card deposits only (exclusions apply) Welcome Bonus: 100% match up to £100 on 1st deposit. 50x wagering applies (as do weighting requirements). Free Spins: Awarded on Jackpot City Gold Blitz once you have staked £20 on any Games Global game. Spin value = 10p. No wagering requirements on free spin winnings. Full Terms.
6		100% up to £100	Pub Casino	Sign-Up	18+ Welcome bonus for new players only | Maximum bonus is 100% up to £100 | Min. deposit is £10 | No max cash out | Wagering is 40x bonus | Maximum bet with an active bonus is £5 Eligibility is restricted for suspected abuse | Skrill & Neteller deposits excluded for welcome bonus | Cashback when offered, applies to deposits where no bonus is included | Cashback is cash with no restrictions | T&Cs
7		Spend £10 Get 60 Spins	MrQ Casino	Sign-Up	First deposit only. Min deposit & spend £10. Max 60 spins on Book of Dead at 10p per spin. Spins credited upon spend of £10. 18+ Full T&Cs apply. T&Cs.
8		100% Up To £100 + 20 Extra Spins	Neptune Play	Sign-Up	18+. New depositing players only. Min. deposit: £20. Max. bonus: £100 + 20 Bonus Spins on Big Bass Bonanza. Offer valid on the first deposit. Winnings won with bonus spins that require a deposit have no wagering requirements. The match-up bonus that requires a deposit must be wagered 40x. NeptunePlay Welcome Bonus – 100% bonus on your first deposit up to £100. This bonus only applies for deposits of £20 or higher. Bonus Policy and Terms of Service apply. Terms.
9		Up to £100 Welcome Bonus	The Hippodrome Online Casino	Sign-Up	18+. New customers only. You must opt in (on registration form) & deposit £20+ to qualify. Offer valid 7 days from registration. Debit card deposits only (exclusions apply). Welcome Bonus: 100% match bonus up to £100 on 1st deposit 50x wagering applies (as do weighting requirements). Free Spins: Awarded on Big Bass Bonanza once you have staked £20. Spin value = 10p. No wagering requirements on free spin winnings. Full Terms.
10		Get 150% Up To £150 On Your First Deposit	32 Red Casino	Sign-Up	18+ | begambleaware.org | New accounts only. Min deposit £10, 50x Wagering. Claim offer within 7 days. Bonus expires after 30 days, debit card or instant banking only. Game contributions vary, max stake applies. See Full Terms.

How to claim a Slots Bonus

All slot bonuses come with an easy step-by-step guide as to how you can make the bonus your own.

Types of Slots Bonuses

Deciding on which slot machine’s bonus is best for you, you need to compare apples with apples. New online slot games always come with enticing welcome offers which will vary in size and type. Some slots have a 200% deposit bonus while others might only offer free spins with your first deposit. Several slots even give you bonuses with no deposit required at all!

With slot bonuses, you play a lot longer with the same amount of money, giving you ample time to decide if you have found your favourite or need to move on to the next slot

Slots Deposit Bonuses

Deposit bonuses are certainly the most popular bonus offered by casinos. This is where you, as a player, are being offered a little extra than what you actually pay for, but only if you make a deposit with real money.

There is a diverse collection of good deposit bonuses available and we further inspect and compare several types of slot bonuses and how each might benefit you the most.

100% Slot Deposit Bonus

Notably, the best slot bonus is the 100% Slot Deposit Bonus, and we would recommend you opt for this bonus. Over the years, cashback bonuses have become one of the more popular bonuses, especially amongst high rollers. Here are our top 5 Casinos and what terms they require for the bonus to kick in.

200% Slot Deposit Bonus

Instead of settling on only double your deposit, you can triple your deposit with your first slot deposit. Be warned, there are usually steep terms that need to be met with exclusive offers like these. We have read and summarised the fine print for you on these top five casinos:

Slots No Deposit Bonus

Receive a bonus by making no deposit! No deposit bonuses sound fantastic and usually are as good as it sounds, but tricky T&Cs will always apply. Some offers will be a cash bonus while others give you free spins, no deposit needed, but always with a few strings attached.

Here are our select 5 casinos with enticing no deposit bonuses, and what specific terms need to be met before you can withdraw any of the winnings from each bonus offer, respectively.

Free Spins Bonuses for Slots

We love free spins bonuses! It multiplies the time you can spend on a slot without having to use your own money to do so! Mostly, you would need to make a deposit of sorts in order to receive this exclusive offer. 

CasinoGuide has done the homework for you, so look at the following online slot games and what specific offers apply for each selected game in the comparative tables below each casino.

Starburst Slot Bonus

Starburst Slot is a five-reel video slot that NetEnt launched in the market in 2012. They present an elegant and colourful gemstone-themed video slot and offer lucrative bonus features with expanding wilds.

Below are CasinoGuide’s top 4 safe casinos to try out and what they have to offer:

Gonzo’s Quest

Play the most popular slot game the gaming industry offers! Gonzo, our brave and curious explorer, will assist you in your online adventure in search of genuine gold.

Play the original iconic Gonzo’s Quest by Netent, with real money at any of these reputable and safe to play casinos we approve:

Book of Dead Slot Bonus

With an RTP of 96,21% and a chance to win up to 5000x your total bet, the Book of Dead slot is always a good choice. Fearless explorer Rich Wilde takes you on a journey in search of the ancient book, deep inside the ancient pyramids. Remember to opt-in for the bonus offer before the end of the expiry period.

Here at CasinoGuide, we can proudly recommend the following four safe-to-play casinos:

Rainbow Riches Slot Bonus

One of the more thrilling slot machines, containing a Road to Riches Bonus, where you can accumulate five symbols and stand to get awarded a 500x total bet multiplier. This winner of “Best New Slot Site” at the WhichBingo Awards 2020 offers so much to do and play.

Rainbow Riches Casino, operated by Gamesys Operations, can be enjoyed safely at the following regulated casinos, handpicked by CasinoGuide:

Aloha! Clusterpays Slot Bonus

This 6 reel, 5 rows slot machine by NetEnt, works through a Clusterpays mechanic. This effectively means that you will need a cluster of symbols, horizontally or vertically (next to each other) in order to win big. Land on Free Spins to take advantage of the high RTP of 96,42% and enhance your chances of winning.

Here is a good CasinoGuide approved casino to try out:

Low Wagering Slot Bonuses

All casinos offer lucrative bonuses, but they all come with steep T&Cs. Check out the fine print before you make your first deposit, especially with a low wagering slot bonus.

Have a look at our list of UK Casino Bonuses with low wagering and these 5 safe-to-play casinos for more guidance:

No Wagering Slot Bonuses

A casino that offers no wagering requirements usually comes with its set of T&Cs. Here is CasinoGuide’s list of wager-free online casinos and more approved casinos below to consider playing on:

Terms and Conditions for Slot Bonuses in the UK

We want our players to gamble responsibly at all times. At CasinoGuide, we will always encourage you to be aware of the terms and conditions, paying special attention to these 5 aspects.

Wagering Requirements

You will usually only find the wagering requirements in the fine print section of the terms. This usually refers to an amount of between 30x and 65x your bet, which means you need to wager 30x to 60x on your initial deposit or bonus amount awarded before you will be eligible to withdraw any winnings from said bonus amount or free spins.

Minimum Deposit Limit

Before a bonus is awarded, you usually need to make a minimum deposit of £10 or £20. With a minimum deposit, your reward won’t be unlocked unless a deposit is made with real money.

Time Limits

Sometimes, you will be required to fulfil certain actions within a time period or your bonus will be forfeited. Most of the time, it will apply to free spins, especially those awarded with no deposits.

Game Restrictions

Slot bonuses generally apply to specific and pre-assigned slot games. The idea is to promote a new slot game or the latest release of a game provider. Be sure to check regularly which slot games have slot bonuses to offer.

Max. Win Limits

Most slots bonuses come with maximum win limits, usually around £100. This effectively means you can never withdraw the jackpot if won from bonus spins or bonus cash, even if you do, in fact, ‘hit’ it!