300% SLOTS DEPOSIT BONUS
Last Updated: July 14, 2025Written by Jean Prince
A 300% slots deposit bonus gives you quadruple the amount of money to play with. So, for example, if you deposit £10 and get a 300% bonus, then you will receive an extra £30, giving you a total of £40 to play slots with.
Below we have created a list of the best UK slot sites offering 300% casino deposit bonuses. All the casinos adhere to UK gambling laws and licenses and are completely safe for you to play at in 2025.
LIST OF 300% DEPOSIT BONUSES
At the moment, none of the casinos in our database offer a 300% deposit bonus. While our experts are sourcing the UK market for new 300% bonuses, we have compiled a list of the best alternatives that you can get.
BEST ALTERNATIVES TO A 300% DEPOSIT BONUS
Play £10 Get 30 Free Spins on Secrets of the Phoenix Megaways (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad
Play £10 Get 30 Free Spins on Monopoly Paradise Mansion (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware
Play £10 Get 30 Free Spins on Rainbow Riches (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad
Play £10 Get 30 Free Spins on Double Bubble (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad
PLAYING WITH A 300% SLOTS DEPOSIT BONUS
Casinos usually offer players 100% deposit bonuses. Every now and again a casino will double this to 200% but it is extremely rare for an online casino to offer a 300% bonus.
We have sweeped the casino industry to bring to you the casinos that are currently offering a 300% deposit bonus.
Don’t forget, 300% bonuses will usually come with terms and conditions attached to them which we will detail below.
TERMS AND CONDITIONS OF 300% DEPOSIT BONUS
You should check the terms and conditions of all casino bonuses.
In our table of 300% deposit bonus casinos, we have detailed the terms and conditions for you.
WHY CHOOSE A 300% BONUS?
- Gives you a huge starting bankroll of 4x your initial deposit.
- Allows you to test lots of slots without risking too much of your own money and instead play with the casino’s bonus funds.
OTHER SIMILAR BONUSES
Also, don’t forget to check out our full list of slots bonuses.
FAQS
A 300% casino deposit bonus is a casino bonus where the casino will triple your total deposit amount with extra casino funds to play with. For example, if you make a £10 deposit, the casino will give you an extra £30 to play with giving you a total of £40 in your casino account.
What are the pros and cons of a 300% casino deposit bonus?
The main pro of a 300% casino deposit bonus is that the casino will give you additional funds to play with. The con is that such bonuses usually come with high wagering requirements which make it highly unlikely that you will be able to withdraw any money you win with the 300% bonus.
CONTRIBUTORS
Greetings, I’m Jean Prince
Jean Prince, also known as ‘The Hawk’ in our newsroom is the editor in chief at SlotsHawk.com. He always keeps a hawk eye on the slots market and never lets anything important slip out of his sight.
Editor in Chief since 2020
