Watch The Flash Season 4 full episodes online, free and paid options via our partners and affiliates.

A Surprising Ally - The Flash
Watch The Flash Season 4 Episode 23
"We Are the Flash"
Original Air Date:

We kick things off on a high note. Iris brings Marlize back to Star Labs where the estranged wife suggests a plan to send Barry into...

Going Solo - The Flash
Watch The Flash Season 4 Episode 22
"Think Fast"
Original Air Date:

On The Flash Season 4 Episode 22, shaken by Ralph’s death, Barry isn’t sure he wants to risk any more of his friends’ lives and considers taking on DeVoe solo.

Harry Gets Kicked Out - The Flash
Watch The Flash Season 4 Episode 21
"Harry and the Harrisons"
Original Air Date:

On The Flash Season 4 Episode 21, Harry hits an all-time low when the “Council of Wells” kicks him out but then Cisco shows him the “Council of Harrisons."

Time for War - The Flash
Watch The Flash Season 4 Episode 20
"Therefore She Is"
Original Air Date:

On The Flash Season 4 Episode 20, Barry and Team Flash team up with Gypsy to try and outwit the Thinker, but will it be too late?

Citizen Cold Returns - The Flash
Watch The Flash Season 4 Episode 19
"Fury Rogue"
Original Air Date:

On The Flash Season 4 Episode 19, Barry needs help transporting a dangerous meta and ends up calling upon a new friend for help, Leo Snart, AKA Citizen Cold.

The Thinker's Lair - The Flash
Watch The Flash Season 4 Episode 18
"Lose Yourself"
Original Air Date:

On The Flash Season 4 Episode 18, Ralph considers crossing a dangerous line to defeat DeVoe, when the team finds a way to enter The Thinker's lair.

Looking For a Favor - The Flash
Watch The Flash Season 4 Episode 17
"Null and Annoyed"
Original Air Date:

On The Flash Season 4 Episode 17, Ralph and Barry clash when they take different approaches to finding the remaining bus metas before DeVoe gets to them.

A Meta With Great Power - The Flash
Watch The Flash Season 4 Episode 16
"Run, Iris, Run"
Original Air Date:

On The Flash Season 4 Episode 16, Iris is given Barry's abilities and is forced to suit up, but how does she do?

Killer Frost Is Hurt - The Flash
Watch The Flash Season 4 Episode 15
"Enter Flashtime"
Original Air Date:

On The Flash Season 4 Episode 15, Jesse and Jay Garrick join forces with The Flash when a bomb detonates in Central City.

Help In The Battle - The Flash
Watch The Flash Season 4 Episode 14
"Subject 9"
Original Air Date:

On The Flash Season 4 Episode 14, Barry meets a powerful woman who could help him in his battle with DeVoe, who is targeting everyone who was on the bus.

Protecting His Cellmates - The Flash
Watch The Flash Season 4 Episode 13
"True Colors"
Original Air Date:

On The Flash Season 4 Episode 13, Barry is forced to make a decision about whether he should expose his powers in order to save his cellmates.

Temporary Powers - The Flash
Watch The Flash Season 4 Episode 12
"Honey, I Shrunk Team Flash"
Original Air Date:

On The Flash Season 4 Episode 12, Cisco and Ralph get caught in the crossfire and end up being shrunk by a meta who does battle with Team Flash.

The Elongated Man - The Flash
Watch The Flash Season 4 Episode 11
"The Elongated Knight Rises"
Original Air Date:

On The Flash Season 4 Episode 11, while Barry is detained by his trial, Ralph must defend the innocent as a familiar villain returns to terrorize Central City.

How Far To Go - The Flash
Watch The Flash Season 4 Episode 10
"The Trial of The Flash"
Original Air Date:

On The Flash Season 4 Episode 10, Iris and Joe must decide how far they are willing to go to keep Barry out of prison when he is put on trial for murder.

Barry is Worried - The Flash
Watch The Flash Season 4 Episode 9
"Don't Run"
Original Air Date:

On The Flash Season 4 Episode 9, DeVoe puts a dangerous plan in motion as he kidnaps Barry and the scarlet speedster may lose someone he loves.

The Flarrow Bros - The Flash Season 4 Episode 8
Watch The Flash Season 4 Episode 8
"Crisis On Earth-X, Part 3"
Original Air Date:

On The Flash Season 4 Episode 8 the heroes of the Arrowverse come together for Barry Allen and Iris West's wedding which gets crashed by evil forces from Earth-X.

Meeting DeVoe - The Flash
Watch The Flash Season 4 Episode 7
"Therefore I Am"
Original Air Date:

On The Flash Season 4 Episode 7, with the wedding just a week away, Iris adds the final touches, while, Barry comes face to face with DeVoe.

Two Cool Superheroes - The Flash
Watch The Flash Season 4 Episode 6
"When Harry Met Harry"
Original Air Date:

On The Flash Season 4 Episode 6, Barry tries to train the new recruit in the team, but his efforts fail badly.

A Night to Remember - The Flash
Watch The Flash Season 4 Episode 5
"Girls Night Out"
Original Air Date:

On The Flash Season 4 Episode 5, Felicity Smoak stops by and the girls head out for a night on the town, but someone causes drama for them.

Gypsy's Father Visits - The Flash
Watch The Flash Season 4 Episode 4
"Elongated Journey Into Night"
Original Air Date:

On The Flash Season 4 Episode 4, Barry runs into an old enemy, while Cisco is shocked when Gypsy’s father, Breacher, unexpectedly shows up on Earth-1.

Speed Vs Luck - The Flash
Watch The Flash Season 4 Episode 3
"Luck Be A Lady"
Original Air Date:

In The Flash Season 4 Episode 3 Barry and the team are hit by a string of back luck when a new meta Hazard comes back to Central City.

Shiny Flash Suit - The Flash
Watch The Flash Season 4 Episode 2
"Mixed Signals"
Original Air Date:

On The Flash Season 4 Episode 2 Iris West and Barry Allen go to couples therapy while Cisco Ramon and Gypsy deal with relationship issues of their own.

Can You Dig The Flash-y Vibe
Watch The Flash Season 4 Episode 1
"The Flash Reborn"
Original Air Date:

On The Flash Season 4 Episode 1, it's been six months since Barry entered the Speed Force. Despite that, Team Flash continues to protect Central City.

The Flash Season 4 Quotes

Eobard: Unfortunately, Miss Danvers, we need you awake for this procedure.
Kara: My, my cousin... he'll find you.
Eobard: Your cousin. Really? Fun tidbit. I fought your cousin once. In the future. He is fast. I'm faster.

What is a nice girl with two doctorates and a Ph.D. doing at a rat's nest like this one?

Cisco