No. Portrayals of the Flash have rarely shown him to be able to survive in the vacuum of space.
- This is the previous DCU's Wally West discovering he is outside on the surface of the moon. (Don't ask why Jeff Loeb thought they should be able to TALK or hear in the vacuum of space.)
I can make a case for a Flash capable of utilizing the Speed Force, being able to survive in the vacuum of space.
- One of the Flash's powers allows him to become intangible to matter and able to ignore his environment. This power becomes active when he starts moving faster than the speed of sound.
Why the speed of sound? In atmosphere, the Flash's speed soon becomes problematic as distances diminish through the use of his fantastic speeds (i.e. 600 miles per hour becomes 1 mile per second!) At slower speeds his prioperception (personal awareness of his physical body in relationship to his surroundings) he can pay attention to his environment and dodge things he approaches, but once he moves at high mach speeds or low percentages of the speed of light, being intangible is the safest approach.
Imagine what happens when he approaches 1% the speed of light (6,706,166.29 miles per hour, 111,769.43 miles per second or the ability to circle the globe several times in a single second).
While the Speed Force supposedly protects the environment from him, what protects him from the environment?
His intangibility. As he approaches the speed of light, under normal physics, objects grow heavier as they approach the speed of light. Not the Flash. Why?
Because he is becoming more like light and less like matter. The faster he goes, the more he behaves like a beam of electromagnetic energy. Including becoming and remaining intangibly out of phase and safe from harm.
From Flash 109, one of the earliest uses of his molecular intangibility.
- He would use his intangibility to protect people from the use of his power. Since he can vibrate his molecular structure and maintain complete control of it, there is no reason he couldn't exist in space as a vibrating molecular waveform, completely removed from the environment of space.
There may be a time limit to how long he could do this but I have not seen him have any difficulty maintaining his intangibility. In Kingdom Come, the Flash has become a form of omnipresent energy where "flesh and blood... give way to... energy"...
During Wally West's run as the Flash, approached the speed of light and the speed force so often he became a being composed of pure energy. Again, not saying Flash must be portrayed that way, but certainly there is ample precedent for saying Flash is an energy being and not subject to the ills of space. Near the end of the series, Wally West approached the speed of light so often he became a being composed of pure energy.