In this question, the answer explores the calculated and proposed speeds that the flash can run/jog at.
In this question, it was determined the Flash could run faster than the speed of light. To me these beg a single question.
Can the Flash run fast enough to escape a black hole?
EDIT: Assume the black hole is "sucking" a massive asteroid belt, and the flash is "running and jumping" from asteroid to asteroid.
EDIT2: I found a link here where it is mentioned the Flash can step on single molecules. Even without the asteroids, let's assume this is true (as there's things flying into the black hole for him to "step?" on). This may not be canon, but it's been seen by multiple people, so maybe there is canon somewhere?