400% Casino Bonus: Top UK Sites

5 Top Online Casinos with 400% Bonus

Here are the top five casinos with 400% Bonus. These sites meet all our standards, and we truly enjoyed playing there.

✅ Flash Dash Casino

Founded in 2023, FlashDash Casino operates under a Curaçao eGaming license and targets players seeking fast-paced gameplay and modern design. The platform blends sleek visuals with a strong focus on both casino games and sports betting.

• Get Started Bonus – 400% match up to €400 + 100 free spins; standard 40x wagering applies

• Game Collection – Over 3,000 titles including slots, roulette, blackjack, live casino tables, and crash games

• Sports Coverage – Covers football, basketball, tennis, MMA, eSports, and virtual sports with live betting options

• Payment Methods – Accepts Visa, Mastercard, Bitcoin, Ethereum, Litecoin, USDT, Skrill, and Neteller

• Banking Rules – Minimum deposit from €10; withdrawals typically processed within 24–72 hours

• Extra Offers – Weekly cashback, reload bonuses, crypto deposit rewards, and free spins promotions

• Site Safety – Protected by SSL encryption; responsible tools include deposit limits and time-outs

• Help and Support – Live chat and email support available 24/7 for all registered users

• User-Friendly Design – Fully responsive across mobile phones, tablets, and desktops

• Fast Registration – Quick sign-up with minimal verification steps

• Player Tools – Features like self-exclusion and cool-off periods encourage safe play

Flash Dash Casino

£1000 + 250 FREE SPINS

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✅ Golden Lion Casino

Golden Lion Casino, launched in 2016 and operated by Blue Media N.V., is a Curacao-licensed platform known for its wide selection of games and generous bonuses. With over 5,000 titles and full mobile compatibility, it’s a solid choice for players seeking variety and convenience.

• Game Library – Over 5,000 games, including slots, table games, and live dealer titles from Betsoft, Rival, and Saucify.
• Payment Options – Supports Visa, MasterCard, Bitcoin, Neteller, Skrill, and bank wire transfers.
• Mobile Friendly – Fully optimized for smartphones and tablets with no app download required.
• 24/7 Support – Customer service available via live chat, email, and phone at any time.

GoldenLion Casino

Welcome Offer 100% Bonus up to €100

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✅ Magic Win Casino

This online casino gives players access to a large selection of games, fast payments, and both casino and sports betting in one place.

• Magic Win Casino, launched in 2022, holds a Curacao eGaming license.

• More than 5,000 games available

• Includes online slots, blackjack, roulette, and other table games

• Large selection of live dealer games

• Games from well-known providers for smooth and reliable play

• Full sportsbook available

• Covers football, basketball, tennis, eSports, and more

• Supports both pre-game and live betting

• Simple and clear betting layout

• Allows cryptocurrency payments: Bitcoin, Ethereum, Litecoin

• Minimum deposit: €15 for cards, €5 for crypto

Magic Win Casino

400% UP TO £2000 + 140 FS

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No expiration date

✅ iWin Fortune Casino

Founded in 2022 and licensed by Curacao eGaming, iWin Fortune Casino is a modern site with generous crypto-friendly bonuses and over 3,000 games to choose from.

• Over 3,300 games.

• Slots: Titles like Candy Boom, Club Tropicana, Tiger Kingdom Infinity Reels.

• Live Casino: 60+ games including Blackjack, Roulette, Baccarat from Vivo and Playtech.

• Table Games: Multiple versions of classic games like Blackjack and Roulette.

• Other Games: Bingo, video poker, scratch cards.

• Accepts Visa, Mastercard, Bitcoin, Ethereum, Litecoin, and Tether.

• Minimum deposit of €15; withdrawals typically processed within 24 hours.

• Bonuses & Promotions:

  • 6-part welcome bonus + 200 Free Spins.

  • Daily and weekend reloads, crypto deposit bonuses.

• Mobile Compatibility: Runs smoothly on Android and iOS browsers. No app required.

• Customer Support: 24/7 via live chat and email.

iWin Fortune Casino

400% up to €2000 + 145 FS

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✅ 31 Bet Casino

31Bet Casino, a new casino established in 2021, is operated by Onyxion Malta Limited and holds a license from the Malta Gaming Authority (MGA/B2C/824/2020).

• Over 3,000 games, including slots, table games, and live dealer options from top providers like Pragmatic Play, Microgaming, and Betsoft.
• Features a comprehensive sportsbook.
• Supports multiple payment options, including credit cards (Visa, MasterCard, Maestro), eWallets, and bank transfers.
• Mobile Compatibility: PCs, mobile devices, and tablets
• Provides 24/7 customer assistance through live chat and email.

31Bets Casino

425% up to 2000£

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Why Do Casinos Give a 400% Deposit Bonus?

Many online casinos give a 400% deposit bonus to bring in new players and keep regular ones interested. This bonus gives players extra funds to try more games and spend more time on the site. It helps casinos attract attention in a busy market and encourages more deposits. These offers usually come with wagering rules that players must follow before taking out any winnings. This keeps players active on the site and leads to more bets placed.

Different 400% Deposit Bonus Offers at Online Casinos

Online casinos offer 400% deposit bonus both new and existing players. Some bonuses apply only to the first deposit amount, while others are spread across multiple deposits. Common offers include welcome packages, reload bonuses, and crypto-specific promotions. These bonuses often come with specific terms, such as wagering requirements and game restrictions. Existing players can also benefit from loyalty programs that include similar high-percentage bonuses to keep them engaged and playing for longer.

Other Deposit Bonus Offers:

• 100% Welcome Bonus
• 150% Deposit Match Bonus
• 200% Casino Welcome Offer
• 300% Deposit Match Bonus
• 400% Casino Welcome Deal
• 500% Deposit Bonus

Things to Consider Before You Claim a Casino 400% Bonus

Think about key details before you claim a 400% casino bonus to increase your winnings.

1. Check the bonus value and ensure it fits your budget.
2. Be aware of the maximum bonus amount, as casinos often set limits.
3. Read the full bonus terms, including the required bonus code and any restrictions.
4. Pay attention to betting limits, which can affect how much you can wager per game.
5. Different games contribute differently to wagering; check the game contributions section.
6. Lastly, understand the max cashout rules to avoid losing potential bonus winnings from the bonus package.

How to Claim a 400% Casino Bonus UK

1. Sign up for a casino account – Choose a casino offering a 400 first deposit bonus and complete the registration process.
2. Make your first deposit – Select your preferred payment method and deposit the required amount.
3. Enter the promo code – If required, input the code to activate the bonus.
4. Check eligible games – Review the terms to know which games contribute to the bonus.
5. Claim the bonus package – Some casinos offer it over the first few deposits.
6. Start playing – Enjoy your bonus on eligible games.

Games to Play with 400% Online Casino Bonus

Using a 400% online casino bonus is a great way to explore different games across multiple casinos. These bonuses allow you to try a wide variety of casino games, from exciting slots to thrilling live dealer experiences. Here are some of the best games you can play with your bonus:

🎰 Slot Games

Slot games are the most popular choice for using your bonus. They come in many themes and styles, offering features like free spins, bonus rounds, and jackpots. Many casinos allow bonuses to be used on slots such as Starburst, Gonzo’s Quest, and Book of Dead. Slots are a great option because they often contribute 100% to wagering requirements.

🃏 Live Casino Games

You can use your bonus to play live games such as blackjack, roulette, and baccarat. These games are hosted by real dealers and streamed live, so it feels more like playing in a real casino. However, live casino games usually count less toward meeting the bonus wagering rules. For example, if slots count 100%, live games might count only 10% or 20%. This means you’ll need to bet more to meet the same requirement.

♠️ Table Games

Blackjack and poker require strategy and offer better odds, but they often have lower wagering contributions compared to slot games.

🎟️ Scratch Cards

For quick and easy wins, you can try scratch cards. These simple games reveal prizes instantly and are a fun way to use your bonus.

💰 Progressive Jackpot Games

Some casinos let you use part of your bonus on progressive jackpots, where prizes can reach millions. However, always check the terms to see if these games qualify for bonus play.

Tips for Choosing the Right Games

• Always check the terms to see which games contribute most to the wagering requirements.
• Slot games usually contribute 100%, while table and live casino games contribute less.
• Play different games to have fun and meet bonus rules.

How to Cash Out Winnings from a 400% Welcome Bonus

1. Meet Wagering Requirements – Ensure you’ve completed the required number of bets as outlined by the gaming sites.
2. Check Bonus Terms – Review conditions such as withdrawal limits and eligible games.
3. Verify Your Account – Submit necessary ID documents for security checks.
4. Choose a Withdrawal Method – Select from available payment options.
5. Request a Cashout – Enter the desired amount and confirm the withdrawal request.
6. Wait for Processing – Most gaming sites process payments within 24 to 72 hours.
7. Receive Your Funds – Funds will be credited to your chosen payment method.

Tips for Winning with a 400% Casino Bonus

☑️ Read the Bonus Terms Carefully

Make sure you know the rules of the 400% bonus, including how the wagering works and which games count, so you don’t miss out on your winnings.

☑️ Choose Low-Variance Games

Slot games with lower volatility can provide frequent smaller wins, helping you meet bonus conditions faster.

☑️ High Contribution Games

Prefer games like slots, which contribute 100% to the wagering requirement, instead of live dealer games, which usually contribute less.

Manage Your Bankroll Wisely

Set limits on bets and play within your budget to avoid losing your entire bonus too quickly.

☑️ Take Advantage of Promotions

Some casinos offer extra promotions on top of the 400 bonus casino, such as free spins or cashback.

☑️ Start with Small Bets

This helps extend gameplay and increases your chances of fulfilling the bonus requirements.

☑️ Track Your Progress

Keep an eye on how much wagering you’ve completed to plan your next steps effectively.

☑️ Play Games You Know

Stick to familiar games to improve your odds instead of trying out complex options that may not suit your style.

☑️ Avoid High Risk Strategies

Don’t place large bets in hopes of clearing the bonus quickly; a slow and steady approach works best.

☑️ Withdraw Smartly

Once wagering is completed, withdraw winnings promptly to secure your profits and avoid unnecessary spending.

400% Deposit Bonus Casinos FAQ