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. 423:1 is a chance of getting a Four of a Kind. 86:1 is a chance of getting a Full House. Only one of 93 combinations can be a Flush. Only one of 85 combinations can be a Straight. 13:1 is a chance of getting a Three of a Kind. The chance of getting Two Pairs is 8:1. 5:1 is a chance of getting a High Pair. Internet Straight Poker Payoff.