Straight Flush in Poker: Meaning and Ranking

A straight flush combines two requirements: a five-card straight and a five-card flush. All cards must be consecutive in rank and share one suit, so 7-8-9-10-J of clubs qualifies while 7-8-9-10-J in mixed suits does not. The highest card sets the hand value; a queen-high straight flush beats a jack-high straight flush, and suits do not break ties in standard poker rules.

Aces have limited flexibility. They can sit high in 10-J-Q-K-A, which forms the royal flush, or low in A-2-3-4-5, often called a five-high straight flush. They cannot wrap around, so Q-K-A-2-3 is not a straight. In Canada-facing online poker and video poker, this distinction matters because hand-ranking engines, RNG-tested game rules, and paytables evaluate the exact five-card pattern rather than the visual closeness of ranks.

In five-card poker, a straight flush has 36 non-royal combinations from 2,598,960 possible hands. That equals about 0.00139%, or roughly 1 in 72,193 deals; if royal flushes are counted inside the same category, the total becomes 40 combinations, about 0.00154%, or 1 in 64,974. In seven-card games such as Texas Hold’em, the chance of making a straight flush by the river is about 0.0279%, or close to 1 in 3,590 hands.

Strategy changes by format. In poker against other players, a made straight flush almost always wants value, but bet sizing should consider board texture, stack depth, and whether opponents can hold a strong second-best hand such as four of a kind or a full house. In video poker, the same term appears in fixed paytables, so the correct decision depends on expected value rather than bluffing or table image.

Comparative Hand Strength

A straight flush loses only to a higher straight flush, including the royal flush when treated separately. It beats four of a kind, a full house, a flush, a straight, three of a kind, two pair, one pair, and high card. The comparison is rank-based, not suit-based, so an eight-high straight flush in spades ties an eight-high straight flush in hearts if the game permits identical hand values.

This hierarchy gives the hand exceptional showdown value, but it is not always paid the same way across games. Poker cash games settle by winning the pot, while video poker and casino table variants may attach separate paytable multipliers or bonus awards. Canada players should read posted rules carefully, especially in regulated markets such as Ontario where licensed operators must display game rules, odds information, and responsible gambling tools clearly.