Ranking DC Speedsters from fastest to slowest (with a couple of exceptions)
I won't put Barry and Wally on this list, nor will I count any of their alternate versions (Futures End Flash, Dark Flash...). I also won't put any speedster faster than Barry or Wally (like Hunter Zolomon). To be clear, combat and reaction time speed only (regardless of whether they are fighting or reacting while flying or on foot). Traveling speed feats don't count. Also, mainstream DCU only (again, with couple exceptions).
Edit: If I don't know how fast a speedster is, I will just put him/them at the button and classify them as "unknown".