Best Slots Bonuses

Looking for the best slots bonuses is something that every fan of slot games can benefit from. 

Bonuses mean extra cash and free spins.

Using an online slots bonus lets you spend more time playing your favourite games, without having to spend more money.

Our guide to the best slots bonuses reviews the casinos offering the top rewards of 2020. 

Read it now and discover which sites offer the best free spins and welcome bonuses for you.

Best slots bonuses casinos reviewed by OnlineCasinos.co.uk 

• bgo 

• The Grand Ivy Casino

• LeoVegas

• Playzee

• Casimba

• Dream Vegas

• Mr Green 

• PlayOJO

Casinos with the best slots bonuses of 2020 

• The Grand Ivy Casino: Welcome bonus up to £1500 + 100 bonus spins

• bgo: Deposit £10 and win up to 500 free spins

• PlayOJO: Get 50 free spins on 1st deposit

• LeoVegas: Welcome bonus up to £400 + 100 bonus spins

• Playzee: 100% up to £300 Bonus + 100 bonus spins 

• Casimba: Welcome bonus up to £500 + 50 bonus spins

• Dream Vegas: 100% up to £400 + 50 bonus spins

• Mr Green:  100% up to £50 +50 free spins

• Mansion Casino: 10% cashback + £500 welcome package

• 888: 200% up to £400

The Grand Ivy Casino: Welcome bonus up to £1500 + 100 bonus spins

Credit: The Grand Ivy Casino

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

The Grand Ivy Casino is the gambling site that has the best slots bonuses. It offers a welcome bonus of £1500, along with 100 free spins. 

This means you could get plenty of credit to use to play your favourite slots games. 

Three top features of The Grand Ivy Casino:

• 989 different slots games for you to play 

• Impressive loyalty rewards scheme 

• Website is very easy for you to use 

The Grand Ivy Casino’s slots bonuses are one of the best things about the site. But the thing that really stands out is the classy look of its website, which has the feel of a leading land casino. 

Credit: Grand Ivy Casino

Three best slots games you can play at The Grand Ivy Casino:

• Mega Moolah 

• Treasure Nile

• Star Spinner 

Sign up to The Grand Ivy Casino today and get the most from the slot bonuses on offer.

Wagering requirements ⭐⭐⭐ 35x 

Bonus offer terms and conditions

18+. New players only.

One bonus offer per player. Minimum deposit £20. Max bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Bonus funds must be used within 30 days otherwise any unused bonus shall be removed. Bonus funds are 100% match up to £300 on your 1st deposit, 25% match up to £800 on your 2nd deposit, and 50% match up to £400 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute towards any wagering requirements.

Terms apply. BeGambleAware.org.

bgo: Deposit £10 and win up to 500 free spins

Credit: bgo Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

You can get one of the best slots bonuses of any UK gambling site from bgo Casino, but have to work for your rewards.  

You simply deposit £10 and then test your skills against its Mega Wheel. If you play well, then you can earn up to 500 free spins. If you don’t, your rewards are much lower. 

Three top features of bgo Casino:

• Enormous amount of Vegas style slots 

• Lots of regular bonus promotions 

• Brilliant 24/7 virtual sports betting  

You could get lots of free spins from bgo Casino, but that’s not all you’ll like about the site. One of the best things about it is the daily slots tournaments. These pit you against rival players for the chance to win some impressive prizes.

Credit: bgo Casino 

Three best slots games you can play at bgo Casino:

• Gonzo’s Quest 

• bgo Branded Megaways 

• Book Of Kings 

Visit bgo Casino today, deposit £10 and then put your skills to the test to earn a slots welcome bonus.

Wagering requirements⭐: 65x

Bonus offer terms and conditions

Win up to 500 free spins on your 1st deposit

*Free spins offered on Twin Spin slot

*Key terms *

**UK only. Win up to 500 spins from Mega Wheel on 1st deposit. 24-hour expiry. Max bet £2.50, Max Spins win £8 per 10 spins, Max Bonus win £150, selected games & 65x wagering on winnings. Min deposit £10. No Neteller/Skrill. Deposit/withdrawal fees apply. Full T&Cs apply.

PlayOJO: Get 50 Free Spins On 1st Deposit

Credit: PlayOJO Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

PlayOJO Casino has one of the top deposit bonuses of any UK slots site. Make a minimum deposit of £10 and you’ll get 50 free spins. 

Doesn’t sound that impressive? There are also no wagering requirements, so you can get the benefits of the offer without investing more of your own cash.

Three top features of PlayOJO Casino:

• Over 3000 games for you to pick from

• Outstanding app for mobile gambling 

• Huge collection of live casino games

While PlayOJO Casino’s commitment to having no wagering requirements for its bonuses is really impressive, it’s the games that make it stand out. Almost no site can compete with the 3000+ on PlayOJO Casino’s catalogue. 

Credit: PlayOJO Casino 

Three best slots games you can play at PlayOJO Casino:

• Curse Of The Werewolf Megaways

• Buffalo Rising Megaways

• Rich Wilde And The Book Of Dead

Visit PlayOJO Casino’s website today and sign up for one of the best slots deposit bonus offers you’ll find at any UK gambling site.

Wagering requirements⭐⭐⭐⭐⭐: 0

Bonus offer terms and conditions

For every £1 deposited, one Free Spin will be credited to the players account up to 50 Free Spins (on Rich Wilde and the Book of Dead). Also, after the first deposit the player can claim an additional 30 Free Spins by visiting the Kicker Section, so the player can receive a total of up to 80 free spins. Please refer to the landing page for all the details.

For every £1 deposited, one Free Spin will be credited.

18+ Please Gamble Responsibly. Full T&C's Apply - Click Here  BeGambleAware.org

LeoVegas: Welcome bonus up to £400 + 100 Bonus Spins

Credit: LeoVegas Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

LeoVegas Casino makes a strong case for having one of the best slot bonus offerings in the UK gambling scene. 

You get up a cash welcome offer of up to £400, along with 100 free spins. This means that you can earn plenty of casino credit to use on your favourite slots games. 

Three top features of LeoVegas Casino:

• Over 600 slots games

• 24/7 customer support 

• Fine range of sports betting 

Our favourite thing about LeoVegas Casino is that it’s a real all-rounder. It has the bonuses you want, plenty of games, lots of live casino titles, and the option to place an array of sports bets.

Credit: LeoVegas Casino 

Three best slots games you can play at LeoVegas Casino:

• Startburst 

• Book Of Dead

• Deadwood 

Create an account with LeoVegas Casino now and use its slots bonuses to play some of your favourite games. 

Wagering requirements⭐⭐⭐: 35x

Bonus offer terms and conditions

Message: Up to £400 in Welcome Bonus Offers + 100 Spins

Significant terms: New eligible UK players only. Select Casino offer on sign-up and deposit. 4 deposits of £10, £20, £50, £100 matched with a bonus cash offer of the same value (14 day expiry). 35x real money cash wagering (within 30 days) on eligible games before bonus cash is credited. Spins credited upon deposits; under £50 =10 Spins, £50 or over =25 Spins; on Book of Dead only (3 day expiry, winnings paid in cash). Play Responsibly. 18+.

Full terms & conditions apply. BeGambleAware.org.

Playzee: 100% up to £300 Bonus + 100 Bonus Spins 

Credit: Playzee Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

Playzee Casino features a deposit bonus that slots fans will adore. You can receive a deposit bonus of 100% up to £300, giving you the chance to get some extra cash to use on the site’s many slots games.

And if that wasn’t enough, you also get 100 free spins that you can use on Starburst — one of the best and most popular slots games.

Three top features of Playzee Casino:

• Some great daily bonus offers

• Incredibly user-friendly website 

• Superb loyalty reward scheme 

What most impresses us about Playzee Casino is how easy it is to use the website. You can filter by games provider, new or top rated titles, and the type of games you want. It couldn’t be simpler to find what you need. 

Credit: Playzee Casino  

Three best slots games you can play at Playzee Casino:

• Gods Of Power 

• Poison Eve

• Rainbow Jackpots

Visit Playzee Casino today and make the most of the site’s welcome bonus slots offers. 

Wagering requirements⭐⭐⭐: 35x

Bonus offer terms and conditions

18+. New players only. Min Deposit £20. Max Bonus Bet £5. Winnings from spins capped at £50. 100 Zee Spins valid on Starburst (first 10 credited immediately upon first deposit; rest credited at 07:00 GMT at 10/day). Spins must be used by 23:59 GMT of the day on which they are credited to the player’s account, any unused shall be removed. Bonus funds must be used within 30 days. Bonus funds are separate to Cash funds, and subject to 35x wagering (bonus + cash). 

Full terms apply. BeGambleAware.org.

Casimba: Welcome bonus up to £500 + 50 Bonus Spins

Credit: Casimba Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

Casimba Casino is a new site that’s perfect for slots fans. It has lots of games, an impressive casino slots bonus package, and a great app for mobile gambling.

Three top features of Casimba Casino:

• Plenty of jackpot slots games 

• Huge array casino software providers

• Lots of progressive slots titles 

Bonuses are one of the key things about a great gambling site, but the most important detail is always the games. This is where Casimba Casino really excels, with games for all types of players and plenty of them. 

 

Credit: Casimba Casino 

Three best slots games you can play at Casimba Casino:

• Ghost Glyph

• Stellar Portals

• Book Of Loki

Visit Casimba Casino now to find out more about its slots bonus offering for UK players. 

Wagering requirements ⭐⭐⭐: 35x

Bonus offer terms and conditions

18+. New players only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Bonus funds expire in 30 days, unused bonus funds will be removed. Bonus funds are 100% match up to £500 on your 1st deposit, 25% match up to £1000 on your 2nd deposit, and 50% match up to £500 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution.

Terms apply. BeGambleAware.org.

Dream Vegas: 100% up to £400 + 50 Bonus Spins

Credit: Dream Vegas Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

Dream Vegas Casino is a great site for slots fans that want rewards to go with their games. 

There are bonus casino slots games, along with an introductory package that offers 50 free spins and a cash reward of 100% up to £400.  

Three top features of Dream Vegas Casino:

• Great selection of video slots titles 

• Plenty of Scratch & Fun games 

• Impressive ad hoc bonus rewards 

 

Credit: Dream Vegas Casino 

Three best slots games you can play at Dream Vegas Casino:

• Starburst

• The Goonies

• Bonanza 

The best thing about Dream Vegas Casino is the slick gameplay you get when you play its many games. There’s never any lag, meaning that you can place your bets and not worry that they’re lost to a buffering issue.

Wagering requirements⭐⭐⭐: 35x

Check out Dream Vegas Casino now to find out why it's one of our top slots sites. 

Bonus offer terms and conditions

18+. New players only.

One bonus offer per player. Minimum deposit £20. Max bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Bonus funds must be used within 30 days otherwise any unused bonus shall be removed. Bonus funds are 100% match up to £400 on your 1st deposit, 40% match up to £3000 on your 2nd deposit, and 60% match up to £1500 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute towards any wagering requirements. 

Terms apply. BeGambleAware.org.

Mr Green: 100% up to £50 + 50 Free Spins

Credit: Mr Green Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

Mr Green Casino is an award-winning gambling site that offers a slot bonus to UK players. You can receive a 100% deposit match up to £50, along with 50 free spins to use on Lucky Mr Green. 

Three top features of Mr Green Casino:

• Outstanding virtual sports games 

• Close to 1700 slots games

• Superb selection of mobile games

Bonuses are one of the things that make Mr Green Casino one of the best options for slots fans, but this isn’t what we like most about it. The thing that keeps us coming back is its commitment to providing a great experience for its players, something confirmed by the many awards it’s won.

Credit: Mr Green Casino 

Three best slots games you can play at Mr Green Casino:

• The Dog House

• Wolf Gold 

• Northern Sky

Create your account with Mr Green Casino now and see for yourself just how great the gambling experience is that it offers. 

Wagering requirements⭐⭐⭐: 35x

Bonus offer terms and conditions

18+. New players only.

Opt in required. New customers only. 1x per customer. Min. £20 deposit. 1st deposit only. Selected games only. Max. Bonus £50 35x wagering and 50 Free Spins at £0.10/spin on Lucky Mr Green 35x Wagering. Free Spins credited once deposit amount has been wagered. Bonus and Free Spins expire 7 days after issue. Game weighting, game, country, currency, player restrictions and terms apply.

T&Cs apply. BeGambleAware.org.

Mansion Casino: 10% Cashback + £500 Welcome Package

Credit: Mansion Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐ 

There’s no free spins offer with Mansion Casino but it still offers one of the best slots bonuses. That’s because the package offers both 10% cashback and the chance to earn a cash welcome bonus of up to £500. 

Three top features of Mansion Casino:

• Low betting limits 

• Brilliant for mobile gambling

• Superb VIP package 

We’re most impressed by Mansion Casino’s low minimum betting limits. This might not be ideal for high rollers, but it’s perfect for new gamblers and people who like to be more cautious when wagering their cash. It means Mansion Casino helps to promote responsible gambling.

Credit: Mansion Casino 

Three best slots games you can play at Mansion Casino:

• Starmada Exiles 

• Big Bear 

• Tip Top Totems 

Visit Mansion Casino now and play some of its many slots with the exclusive sign-up bonus.

Wagering requirements:⭐⭐⭐⭐⭐ 

Bonus offer terms and conditions

18+. New players only.

New Customers. 5% cashback on day 1-7 deps, 10% on day 8-14. Max £1000 p/w. Max 1st deposit bonus £200, 2nd max £300. Min £20 deposit. 40x wagering, valid for 30 days. Game weighting, payment restrictions and betting limits apply. Casino Only. Offer terms and conditions apply.

T&Cs apply. BeGambleAware.org.

888: 200% up to £400

Credit: 888 Casino 

OnlineCasinos.co.uk’s rating of slots bonuses offered: ⭐⭐⭐⭐⭐

It’s rare to find one of our guides that doesn’t highlight 888 Casino, particularly the ones that focus on rewards. 888 Casino might not have free spins right now but its 200% deposit match up to £400 means that it offers one of the best slots bonuses in the UK. 

Three top features of 888 Casino:

• One of the most experienced online casinos

• Brilliant resources to help improve your gambling skills 

• Enormous selection of live casino games

There’s so much to like about 888 Casino and this makes it hard to pick just one thing to highlight. However, what we most enjoy about betting at 888 Casino is its exceptional loyalty rewards. You can win some great prizes, such as weekends away and concert tickets. 

Credit: 888 Casino 

Three best slots games you can play at 888 Casino:

• Millionaire Genie 

• Sunny Reels

• Arcane Gems 

Create your account with 888 Casino today and use its welcome bonus to play your favourite slot games. 

Wagering requirements⭐⭐: 50x

Bonus offer terms and conditions 

18+. New players only.

No Deposit Offer: New players only • £88 is granted in FreePlay (FP) • FP must be claimed within 48 hrs of receiving the email and expires after 14 days • FP wins are credited as bonus and capped at £15, exc. JP win • Special Offer: £20 min deposit • 200% up to £300 Bonus • Bonus wins are capped at £500 • To withdraw bonus & related wins, wager 50 x (bonus amount) within 21 days • Restrictions apply to deposit until wagering requirement fulfilled • Wagering req. vary by game • This offer may not be combined with any other offer • Withdrawal restrictions & full T&Cs apply: No Deposit Offer terms & Special Offer terms

T&Cs apply. BeGambleAware.org.

5 top sites for free spins

Free spins are one of the best slots bonuses for slots players and bgo Casino offers you the most of any site we’ve reviewed. 

You get the chance to earn up to 500 free spins, once you’ve made a minimum deposit of £10. 

However, there is a catch to the offer. 

To get your free spins you need to compete against the site’s Mega Wheel. This means that if you want to get the full 500 free spins on offer, you need to increase your slots gaming skills to deliver the results needed to get the full bonus.

Read our bgo Casino review to learn even more of the reasons that we think this is such a great gambling site. 

5 top sites for cash welcome bonus 

Cash welcome bonuses are one of the best slots bonuses and The Grand Ivy Casino has the top offer that we’ve found.

You can get up to £1500, which is 3x the amount of second placed Casimba Casino. 

To get the full £1500 you need to make three deposits: 

• 1st deposit: 100% match up to £300

• 2nd deposit: 25% match up to £800 

• 3rd deposit: 50% match up to £400 

You also get 100 free spins that can be used on the following games: 

• 1st deposit: Starburst — 25 spins 

• 2nd deposit: Aloha Cluster Pays — 50 spins 

• 3rd deposit: Gonzo’s Quest — 25 spins 

Read our The Grand Ivy Casino review to find out some of the many other great things about this top site.

5 top sites for slots games

Getting the best slots bonuses is important, but it’s little benefit to you if the games on offer at the site don’t meet your expectations. 

PlayOJO Casino is the outstanding site for games. Not only does it have over 3000 in total, but 2800 of these are slot games. 

There’s a great selection of slots titles you can try, from new games to jackpots. 

Read our PlayOJO Casino review to get a more detailed summary of the slots gaming experience you get from the site. 

5 most popular bonus slots games 

Slots are the most popular game at pretty much every UK casino, with many sites offering more slots titles than the rest of their games put together. 

There are thousands of great slots games you can choose from, but these are the most popular ones among the team at OnlineCasinos.co.uk: 

Starburst 

• Paylines: 10

• Reels: 5

• RTP: 96.10%

• Minimum coin size: £0.01

• Maximum coin size: £1.00

• Type of slot: Video slot

• Made by: NetEnt

Book of Dead 

 

• Paylines: 10

• Reels: 5

• RTP: 96.20%

• Minimum coin size: £0.01

• Maximum coin size: £2.00

• Type of slot: Video slot

• Made by: Play'n GO

Thunderstruck II 

• Paylines: 243

• Reels: 5

• RTP: 96.65%

• Minimum coin size: £0.01

• Maximum coin size: £0.05

• Type of slot: Video slot

• Made by: Microgaming

Invisible Man 

• Paylines: 20

• Reels: 5

• RTP: 96.40%

• Minimum coin size: £0.01

• Maximum coin size: £0.50

• Type of slot: Video slot

• Made by: NetEnt

Bees Knees 

• Paylines: 25

• Reels: 5

• RTP: 95.30%

• Minimum coin size: £0.01

• Maximum coin size: £0.50

• Type of slot: Video slot

• Made by: Eyecon

You can play the top slots games using a casino website or a gambling app. 

If you prefer to place your bets using your smartphone, check out our guide to the best apps for slots.

Why free spins are one of the best slots bonuses

Credit: Wikimedia

Free spins are probably the most popular slots bonus. 

The reason for this is pretty straightforward. Each time you play a slots game you spin the reel, then hope that it lands favourably and gives you a payout.

Free spins mean free goes on your favourite slots games and this is why they’re one of the best slots bonuses. 

But there are some things you should keep in mind when choosing free spins offers: 

• You may only be able to use the spins on specific games 

• You may get the full spins amount over several deposits 

• You might have a time deadline for using your free spins

So, make sure you read the T&Cs of any free spins offer you’re thinking of signing up to. Doing this will help you decide if it’s the right offer for you. 

Why welcome bonuses are one of the best slots bonuses

Credit: Wallpaper Flare

Welcome bonuses are offered by most of the top casinos. 

They can be free spins offers but they’re generally a cash reward that you can use to play your favourite games, including slots titles. 

The reason they’re one of the best slots bonuses is that they give you the chance to earn some extra cash, often for depositing your own money. More cash means more available funds to play the slots games you want to. 

However, you should keep  these things in mind when selecting welcome bonuses 

• You may have to meet wagering requirements to get their full benefits 

• You’ll often have to make multiple deposits to get the advertised amount 

• You might be asked to deposit more money than you feel comfortable with

The key is to do what feels right for you. So, consider your bankroll and gambling limits before you choose which welcome bonuses to sign up for. 

Why wagering requirements are key to picking a slots bonus

Credit: PXHere

Wagering requirements are one of the most important parts of the best slots bonuses. 

This is because they tell you how much of your own money you need to wager before you can withdraw the cash that you earn from the bonuses. 

Wagering requirements are shown a ‘x’ the amount of the bonus. Using the example of a £100 welcome bonus, this is how they work: 

• 10x: you need to wager £1000 before you can withdraw the bonus amount

• 20x: you need to wager £2000 before you can withdraw the bonus amount

• 30x: you need to wager £3000 before you can withdraw the bonus amount

So, you shouldn’t just look for the bonuses that offer that most cash or free spins. You should also keep an eye out for the ones that have the lowest wagering requirements.