Superman is fast. But the Flash is just way faster. He is fast enough to travel faster than the speed of light. ... The ability to change the past and create time remnants would be the Flash's trump card in his fight with Superman.

Is the flash stronger than Superman?

7 The Flash

The fact remains for that as fast as Superman may be, the Flash will always be faster, giving him a very distinct advantage over Superman, clearing a path for him to be more powerful.

Can Flash easily kill Superman?

If Barry Allen runs practically at the speed of light, he effectively has the relative mass of a white dwarf star. If he puts all that energy into an attack, he produces an Infinite Mass Punch; a form of attack that can knock someone like Superman across continents -- it can certainly wound him, if not kill him.