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