Not even close. There is no upper limit to the Flash's speed. Forget trying to apply anything you know of physics because he moves beyond them. He has left Superman in the proverbial dust. read more
There is no upper limit to the Flash’s speed. Forget trying to apply anything you know of physics because he moves beyond them. He has left Superman in the proverbial dust. read more
Watch Superman 1,Supes have power to change the alternative time.Superman's speed is almost equal with Flash's speed force because botch can break the timelines. read more
It's already been established that all of the Flashes can move past light-speed via the Speed Force. As for Superman, he's never shown to move at light-speed while running inside a planetary atmosphere. This image should answer your question, though. This scan was taken from Flash v2, #220. read more