Most Popular Online Casinos in June

ReloadBet

Online sports and casino betting · €300 welcome bonus!

Welcome offer:

100% Bonus up to

€300

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

ReloadBet

Online sports and casino betting · €300 welcome bonus!

  • 100% Bonus up to €300 with your first deposit (New customers)
  • ReloadBet offers exclusive bonuses for CasinoBonusCenter visitors
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at ReloadBet
  • Online sports betting
  • Over €11,764,696 in Jackpots by Games Global
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 3.9/5
  • Popularity: This offer has been claimed by 300 visitors so far this month.
  • 32 Game Providers: Play n GO, 3 Oaks Gaming, iSoftBet, Salsa Technology, Yggdrasil Gaming, Evolution Gaming, Red Tiger, Spribe, BRAGG, Blueprint Gaming, Playtech, Vibra Gaming, and others.

KikoBet

Unlock a €500 Welcome Package – Your Gateway to Premier Casino and Sports Betting Thrills!

Welcome offer:

100% Bonus up to

€200

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

KikoBet

Unlock a €500 Welcome Package – Your Gateway to Premier Casino and Sports Betting Thrills!

  • 100% Bonus up to €200 with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • KikoBet offers exclusive bonuses for CasinoBonusCenter visitors
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at KikoBet
  • Online sports betting
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 4.1/5
  • Popularity: This offer has been claimed by 283 visitors so far this month.
  • 26 Game Providers: Pragmatic Play, Spribe, Vibra Gaming, Salsa Technology, Evolution Gaming, iSoftBet, Yggdrasil Gaming, Casino Technology, Playtech, Gamzix, Play n GO, Foxium, and others.

SlottoJAM

€500 welcome reward, weekly tournaments and VIP Club

Welcome offer:

100% Bonus up to

€200

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

SlottoJAM

€500 welcome reward, weekly tournaments and VIP Club

  • 100% Bonus up to €200 with your first deposit (New customers)
  • Bonus available on your second purchase
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at SlottoJAM
  • Online sports betting
  • Over €11,764,696 in Jackpots by Games Global
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 3.9/5
  • Popularity: This offer has been claimed by 257 visitors so far this month.
  • 103 Game Providers: Hacksaw Gaming, Synot Games, Buck Stakes, Salsa Technology, Just for the Win, Indigo Magic, Reevo, Amatic, Endorphina, Neko Games, Hammertime Games, Vibra Gaming, and others.

Rollino

Enter the Fairground with an Exclusive Bonus up to €6,000!

Welcome offer:

200% Bonus up to

€3,000

+ 100 Free Spins

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

Rollino

Enter the Fairground with an Exclusive Bonus up to €6,000!

  • 200% Bonus up to €3,000 + 100 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Rollino offers exclusive bonuses for CasinoBonusCenter visitors
  • Slovenian players are accepted
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at Rollino
  • Online sports betting
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 4.1/5
  • Popularity: This offer has been claimed by 192 visitors so far this month.
  • 85 Game Providers: 1X2gaming, Platipus, Red Rake, Spinmatic, VIVO Gaming, High 5, Amatic, Pragmatic Play, Playbro, ThunderSpin, Barbara Bang, Thunderkick, and others.

KingSpin Casino

Join the Boss’s Inner Circle with a Tripled Starting Balance!

Sign-up Bonus:

30

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

KingSpin Casino

Join the Boss’s Inner Circle with a Tripled Starting Balance!

  • 30 Free Spins · No deposit required
  • Exclusive No-deposit Bonus – Available in Slovenia and Selected Countries
  • 200% Bonus up to €300 + 50 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • KingSpin Casino offers exclusive bonuses for CasinoBonusCenter visitors
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at KingSpin Casino
  • Available in multiple languages, including English
  • Rating: 3.8/5
  • Popularity: This offer has been claimed by 163 visitors so far this month.
  • 43 Game Providers: Gamomat, BF Games, StakeLogic, BRAGG, Relax Gaming, Leap Gaming, Red Rake, Blue Guru Games, ReelPlay, Skywind, Fantasma, Swintt, and others.

Slots Capital

Get €100 Free with Your First €25 Deposit!

Sign-up Bonus:

15

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

Explore bonuses at Slots Capital

Slots Capital

Get €100 Free with Your First €25 Deposit!

  • 15 Free Spins · No deposit required
  • Bonus Code: CAPITAL15SPINS
  • 400% Bonus up to €100 with your first deposit (New customers)
  • Bonus Code: FIRST100FREE
  • Bonus available on your second and third deposit
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required · Optional game downloads available
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Slots Capital is available in English
  • Tested and certified by Casino Bonus Center · Rating: 2.9/5
  • Popularity: This offer has been claimed by 137 visitors so far this month.
  • Game Providers: DragonGaming, Saucify, Arrows Edge, Qora Games, and Rival

Captain Cooks Casino

100 Chances to Be a Millionaire – Just €5!

Welcome offer:

100

Free Spins

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

Captain Cooks Casino

100 Chances to Be a Millionaire – Just €5!

  • 100 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Slovenian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required · Optional game downloads available
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at Captain Cooks Casino
  • Over €2,088,395 in Progressive Jackpots
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 4.2/5
  • Popularity: This offer has been claimed by 130 visitors so far this month.
  • 39 Game Providers: Triple Edge, Hammertime Games, Circular Arrow, SlingShot, Snowborn Games, Foxium, Half Pixel, Neko Games, Buck Stakes, Coin Machine Gaming, Area Vegas, PearFiction, and others.

Top 10 Online Casino Bonuses in Slovenia (June 2025)

Expert-Rated Real Money Casinos with Top Bonuses

Looking for the best online casinos in Slovenia? Our expert team has tested and reviewed hundreds of real money gambling sites to bring you the top 10 choices for June 2025. Casino Classic, Wazamba, and ZotaBet lead our rankings, standing out for their extensive selection of high-paying slots, immersive live dealer tables, exclusive bonuses, and lightning-fast payouts.

Browse our expert-ranked list below and claim your exclusive welcome bonuses today!

Online Casinos SloveniaWelcome Bonus

Get 40 Spins for Just €1

40 Free Spins

Big bonuses, Live casino, and Sports

Bonus of 100% up to €500 + 200 Free Spins

Up to €6,000 Bonus · Unlimited VIP Betting!

Bonus of 100% up to €6,000 + 100 Free Spins

Casino Fun, Beach Vibes, Gangster Style

Bonus of 225% up to €1,000 + 100 Free Spins

40 chances to become a millionaire for €1

40 Free Spins

Join the Boss’s Inner Circle for Big Wins!

Bonus of 200% up to €300 + 50 Free Spins

Unleash 200 Free Spins Today!

Bonus of 100% up to €300 + 100 Free Spins

€200 bonus + 10 free spins on Vegas

Bonus of 100% up to €200 + 10 Free Spins

Get 150 chances to become a millionaire

150 Free Spins

80 chances to be a millionaire for €1

80 Free Spins

* Terms & Conditions Apply ·  Play responsibly

With nearly two decades of experience in the industry, CasinoBonusCenter.com has been analyzing and comparing online casinos since 2006. Our dedicated team of professionals has handpicked the most trusted casinos for Slovenian players to ensure you get the biggest sign-up bonuses, top-tier games, and the most rewarding loyalty programs.