The chances of getting winning combinations. The chance of getting Royal Flush is 40,000:1. The chance of getting Straight Flush is 10,000:1. The chance of getting Four of a Kind is 423:1. 86:1 is a chance of getting a Full House. Only one of 93 combinations can be a Flush. The chance of getting Straight is 85:1. 13:1 is a chance of getting a Three of a Kind. 8:1 is a chance of getting a Two Pairs. Only one of 5 combinations can be a High Pair. Animated Poker Two Pair.