The viewers of season one averaged a 4.62 million viewers. Season two vieres averaged to 4.25 million viewers. Season one ranked 118. Season two ranked 112. Season three doesn't have any average viewers or rankings yet because season three isn't over yet.
The Flash is a very popular TV Show, therefore there are many different ratings. IMDb rated The Flash an 8.5 out of 10. Common Sense Media rated The Flash a 3/5. Graph TV rates The Flash as an 8.2 out of 10. The Deadline says that The Flash ratings have risen to highs with a mega crossover.