In poker, a straight flush is an extremely powerful hand made of five consecutive cards in the same suit. In Texas Hold'em, it is completed only about 0.0279% of the time — roughly once in every 3,589 hands. This article explains what a straight flush is in poker in beginner-friendly terms, from how it is made, its hand ranking, and its probability to how it differs from the royal flush.
What Is a Straight Flush? How Is It Made?
A straight flush is a hand in which five cards are consecutive in rank and all share the same suit. It satisfies the conditions of both a straight (consecutive ranks) and a flush (same suit) at the same time, making it one of the strongest hands in the game.
For example, all of the following combinations are straight flushes:
56789 (a 5-to-9 straight flush in hearts)
89TJQ (a queen-high straight flush in spades)
A2345 (a 5-high straight flush in spades, the wheel)
All five cards must share the same suit and be consecutive in rank. Because the requirements are strict, the hand is extremely powerful once completed.
What Is the Difference Between a Straight Flush and a Royal Flush?
A straight flush and a royal flush are structurally almost the same hand. The only difference is the range of ranks used.
: five consecutive cards of the same suit (from the A-to-5 wheel up to the 9-to-K high)
Royal flush: the highest pattern of all — 10, J, Q, K, A of the same suit
A 10-to-A straight flush is specially called a “royal” and is set apart as the strongest hand in poker. You can think of the royal flush as the highest form of the straight flush.
How Strong Is a Straight Flush? Its Position in the Hand Rankings
In Texas Hold'em, a straight flush ranks above four of a kind and below a royal flush. The hand rankings are as follows (the higher, the stronger):
Royal flush
flush (here)
Full house
Straight
Three of a kind
One pair
A straight flush is the second-highest of the ten hand types. In practice it is nearly unbeatable, and the only hand that can beat it is a royal flush. For an overview of how the hands relate to one another, see the poker hand rankings chart.
If Two Straight Flushes Meet, Which One Wins?
Two straight flushes going against each other are extremely rare, but the rule for deciding the winner is clear.
The winner is decided by the rank of the highest card (the same rule as for straights)
A king-high straight flush (9-K) > a 9-high straight flush (5-9)
A low ace (A-2-3-4-5, the wheel) counts as 5-high and is the weakest straight flush
If the highest cards are equal, the pot is split (a chop). However, two players can never both have a straight flush in the same suit — that is mathematically impossible — so in practice the winner is always clear-cut.
What Is the Probability of Getting a Straight Flush?
In Texas Hold'em, you make your hand by choosing the strongest five cards from the seven total cards: your two hole cards plus the five board cards.
Total number of ways to deal 7 cards from 52:
52C7 = 133,784,560Of these, the combinations that end up as a straight flush (royal flushes excluded):
37,260 combinationsAs a probability:
37,260 / 133,784,560 ≒ 0.000279In percentage terms, that is about 0.0279%, appearing roughly once in every 3,589 hands. It is about 6 times harder to get than four of a kind (about 0.168%), and even in Texas Hold'em you are doing well if you see it a few times a year — a truly ultra-rare hand. For the basics of probability math, see probability knowledge worth remembering when playing poker.
Tips for Chasing a Straight Flush and Recognizing Draws
Chasing a straight flush directly is not realistic, but it can occasionally be completed by accident from a draw.
Straight flush draw: four cards of the same suit that are also consecutive in rank (e.g., 6789 — complete if the river brings 5 or T)
are usually 2 (one card at each end can complete it)
On the flop, holding both a straight draw and a flush draw (a combination draw) is a hint of the final form
A hand that holds both a straight draw and a flush draw is called a combination draw. Including its small chance of making a straight flush, it is a hand with a considerably high win rate.
Frequently Asked Questions About the Straight Flush
Q. Are a straight flush and a royal flush different hands?
A. Strictly speaking, “royal flush” is the name used to distinguish the highest form of the straight flush (10-A). The hand structure is the same, but it is specially treated as the strongest hand.
Q. ween A-2-3-4-5 and 10-J-Q-K-A in the same suit, which is stronger?
A. 10-J-Q-K-A (the royal) is overwhelmingly stronger. A-2-3-4-5 counts as “5-high” and is the weakest straight flush.
Q. Is it realistic to chase a straight flush?
A. Chasing one directly is not realistic. You can only complete it if your outs happen to come in once you reach a straight flush draw (four cards of the same suit, consecutive in rank). Basically, it is a lucky accident: you were chasing a flush or a straight and happened to end up with a straight flush.
Q. What is the probability of completing a straight flush?
A. From a straight flush draw, the completion rate is about 4% by the turn and about 9% by the river. That is far lower than completing a straight or flush draw alone.
Summary
A straight flush is the second-strongest hand, made of five consecutive ranks in the same suit. It appears about 0.0279% of the time in Texas Hold'em — an ultra-rare hand that shows up about once in every 3,589 hands. A 10-to-A straight flush is specially called a “royal flush” and is set apart as the strongest hand in poker. Once completed, it has overwhelming strength and can never lose to anything but the royal flush.
If you want to learn poker hand rankings systematically, check out the poker hand rankings chart. For real practice, the poker learning app “POKER Q'z” comes recommended.