Flush in Poker: Rules, Odds, and How to Play It
A flush is one of the strongest hands in poker, and one of the most misunderstood. Beginners overvalue it on dangerous boards, undervalue the draw that builds it, and regularly lose money by not knowing how it stacks up against a straight. This guide covers the full picture: what a flush is, where it ranks, the real odds of making one, and how to think about flush draws and suited starting hands at the table.
What Is a Flush in Poker?
A flush is any five cards of the same suit. The cards do not need to be in sequence. If you hold K♥ 9♥ 6♥ 4♥ 2♥, you have a flush, even though the ranks are scattered.
Flushes are described by their highest card. The hand above is a king-high flush. If two players both have a flush, the one with the higher top card wins (more on ties below).
Here is a concrete hold’em example. You hold A♦ 8♦. The board reads Q♦ 7♦ 2♣ 4♦ J♠. Your best five-card hand is A♦ Q♦ 8♦ 7♦ 4♦: an ace-high flush. Only a full house or better can beat you here, and nothing on this board makes those possible.
One rule that trips up new players: in hold’em you build your hand from any five of the seven available cards (your two hole cards plus the five community cards). You can use both hole cards, one of them, or none. If four diamonds land on the board, a single diamond in your hand is enough for a flush.
Where the Flush Ranks in Poker
The flush sits fifth from the top in the standard poker hand rankings. Three hands beat it, and five lose to it:
| Rank | Hand | Beats a flush? |
|---|---|---|
| 1 | Royal flush | Yes |
| 2 | Straight flush | Yes |
| 3 | Four of a kind | Yes |
| 4 | Full house | Yes |
| 5 | Flush | – |
| 6 | Straight | No |
| 7 | Three of a kind | No |
| 8 | Two pair | No |
| 9 | One pair | No |
| 10 | High card | No |
The hands directly above the flush matter most in practice. A full house is the realistic threat whenever the board pairs, while a straight flush is so rare you will see it a handful of times in a playing lifetime.
Flush vs Straight: Who Wins?
The flush wins. Every time, in every standard poker variant.
The reason is pure math. In five cards dealt from a 52-card deck, a flush (excluding straight flushes) shows up about 0.197% of the time, roughly 1 in 509 hands. A straight appears about 0.392% of the time, roughly 1 in 255 hands. The flush is about twice as hard to make, so it ranks higher. Hand rankings are not arbitrary tradition; they follow how rare each hand is. Our breakdown of poker hand probabilities shows the full frequency table.
The one exception to watch for is the straight flush, which is a straight and a flush at once. It beats an ordinary flush because it is far rarer still, about 1 in 72,193 hands dealt.
Flush Odds and Probabilities
Two sets of numbers are worth knowing: the odds of being dealt a flush in five cards, and the odds of making one in Texas hold’em, which is the game most people play.
| Situation | Probability | Roughly |
|---|---|---|
| Dealt a flush in 5 cards (excl. straight flush) | 0.197% | 1 in 509 |
| Dealt suited hole cards in hold’em | 23.5% | 1 in 4.3 |
| Flopping a flush with two suited cards | 0.84% | 1 in 119 |
| Flopping a flush draw with two suited cards | 10.9% | 1 in 9 |
| Flush draw hits on the turn | 19.1% | 1 in 5.2 |
| Flush draw hits on the river | 19.6% | 1 in 5.1 |
| Flush draw hits by the river (from flop) | 35.0% | 1 in 2.9 |
| Backdoor flush (one of your suit on flop) | 4.2% | 1 in 24 |
A few things stand out. You will be dealt suited hole cards almost once every four hands, but you will flop a made flush less than once in a hundred. The realistic path to a flush runs through the flush draw: four cards of a suit after the flop, with the turn and river still to come. That draw completes about one time in three if you see both cards.
If you want to check any of these spots against a specific opponent range, the hand equity calculator gives exact percentages for your cards and the board.
Nut Flush vs Weak Flush
Not all flushes are equal, and the difference costs players real money.
The nut flush is the best possible flush on a given board. On a board with three hearts and no higher heart out there, the ace of hearts in your hand gives you the nuts. Nobody can have a better flush, and if the board is unpaired, nobody can have a better hand at all.
A weak flush is everything else. Say you hold 7♠ 6♠ and the board brings three spades topped by the king. You have a flush, but anyone holding the ace of spades, or even the queen, beats you. Small flushes are the classic way inexperienced players go broke, because the hand feels strong while being second or third best.
Three board textures should change how you value a flush:
- Paired board. Any pair on the board puts a full house or quads in play. Your flush is no longer the nuts even if it is ace-high. Big bets from tight opponents on paired boards deserve respect.
- Monotone board (three of one suit). Now everyone with one card of that suit has a flush. Yours is only as good as your highest card of that suit. A nine-high flush on a monotone board is a bluff-catcher, not a value hand.
- Four of one suit on board. The board itself plays as a flush. Only a player holding a card of that suit higher than the board’s best can beat the board. If you have no card of that suit, you are playing the board and hoping for a split.
How to Play a Flush Draw
A flush draw is four cards of a suit with more cards to come. After the flop it gives you 9 outs: the 13 cards of your suit minus the 4 already visible.
Nine outs translates to about 35% to complete by the river and about 19% on the next card alone. That gap drives every flush draw decision. Seeing both remaining cards makes the draw a strong holding. Paying a big bet to see just one card usually does not.
The tool for pricing these calls is pot odds. As a rule of thumb, a flush draw needs roughly 4-to-1 from the pot to justify calling for one card. If the pot offers $80 and the bet is $20, you are getting 5-to-1, and calling shows a profit over time. If the pot offers $40 against that same $20 bet, the price is 2-to-1 and the call loses money on average. The full method, with worked examples, is in our guide to pot odds.
Beyond calling, flush draws are the most common semi-bluffing hands in hold’em. A bet or raise with a flush draw can win the pot immediately, and when it gets called you still have a one-in-three shot to make the best hand. This is why strong players play flush draws aggressively instead of passively checking and calling.
Two cautions. First, draw to the nuts when you can. A 6♥ 5♥ flush draw that completes still loses to any higher heart. Second, discount your draw on paired boards. Hitting your flush does not help if the river card also fills up an opponent’s full house.
Suited Cards and Starting Hands
Everything above starts before the flop, with the two cards you choose to play. About 23.5% of all hold’em starting hands are suited, and suitedness matters, just less than most beginners think.
Holding two suited cards adds a few percentage points of equity compared to the same ranks offsuit, mostly through the flush paths described earlier. Ace-king suited is meaningfully stronger than ace-king offsuit. But 9♣ 4♣ is still a bad hand. The suit turns a marginal hand into a playable one; it does not turn a trash hand into a good one.
The suited hands that play best are the ones with other ways to win: high cards, pairs, and connected cards that can also make straights. Ace-five suited can make the nut flush, a straight, or top pair, which is why it appears in so many aggressive preflop ranges. For a fuller treatment of which holdings deserve your chips, see our guide to poker hand combinations and starting hands.
What Happens When Two Players Have a Flush?
Compare the hands card by card, starting from the top. The player with the highest card in their flush wins. If the top cards match, compare the second-highest, and so on down the line. Suits never break a tie; hearts are not better than clubs.
An example. Player one has A♥ 3♥, player two has K♥ Q♥, and the board shows J♥ 8♥ 4♥ 2♠ 7♣. Player one’s ace-high flush beats player two’s king-high flush. Change player one’s hand to K♥ 3♥, and player two wins because Q♥ beats 3♥ as the second card after both kings tie.
The trap version of this happens when the board already contains four or five cards of one suit. If the river puts a fifth heart on board, every player still in has a flush made from the board, and only someone holding a heart higher than the board’s best heart can improve on it. Split pots are common here.
Flush in Poker: FAQ
Does a flush beat a straight?
Yes. A flush ranks one level above a straight because it is roughly twice as hard to make (about 1 in 509 versus 1 in 255 in five dealt cards). Only a full house, four of a kind, straight flush, or royal flush beats a flush.
What beats a flush in poker?
Four hands: a full house, four of a kind, a straight flush, and a royal flush. The full house is the one you will actually run into, which is why a paired board should always temper your enthusiasm for a flush.
What are the odds of flopping a flush with suited cards?
About 0.84%, or 1 in 119, when you hold two suited cards. Flopping a flush draw (two more of your suit) is far more common at about 10.9%, and that draw completes by the river about 35% of the time.
What is the difference between a flush and a straight flush?
A flush is five cards of the same suit in any order. A straight flush is five cards of the same suit in sequence, like 8♦ 7♦ 6♦ 5♦ 4♦. The straight flush is the second-best hand in poker, beaten only by the royal flush, which is the ace-high version of it.
Does the suit matter when comparing two flushes?
No. All four suits are equal in standard poker. Two flushes are compared purely by rank, highest card first. If all five cards match in rank (possible only when the board plays), the pot is split.
