In this guide, we identify the best paying casino games and slots and recommend the UK online casinos that pay out the most. On average, you expect 96% back when you play slots online, and for the highest payout casinos this rate can go up to almost 98%. This payout percentage is often referred to as RTP or Return to Player Percentage RTP. A payout percentage of 96% means that for every £100 you place in bets you can expect to win £96 back. High payout casinos return a higher percentage to the player than other gambling sites in the casino industry. 🏆 Top Online Casinos with the Highest Payouts 🔎 How to Find the Highest Payout Online Casino Sites UK.⭐ Best Payout Online Casinos by Category.⚖️ 12 Highest Paying UK Casinos Compared.🏆 Top Online Casinos with the Highest Payouts.