The best online casinos like FanDuel, Caesars and BetMGM offer over 1,000 real money slots, including several with a high return-to-player rate. Here are my favorite high RTP slots at these top online casinos, along with some details on the online casino sign-up bonuses and how to claim them.

Best online casinos for high RTP slots in December 2025

Every game at the best real money online casinos has a return-to-player (RTP) percentage, which is the average amount of wagers that get returned to players over the long-term. For example, if a game has a 95% RTP, then players on average will get back $95 for every $100 they wager.

In other words, the RTP tells you what the house edge is on any game, and playing high RTP slots with an RTP of 97% or higher gives players the best chance of wi

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