The Flash is the Fastest Man Alive, and that includes being faster than Kryptonians. While Superman is powerful and a close second as the world's fastest hero, he can't top the Speed Force.
It is mentioned that Superman can travel at approximately 7,680 miles per hour or 12,352 kilometers per hour. To put this into perspective, a commercial airplane's cruising speed is only around 500-600 miles per hour.
The two heroes have raced several times since then, in the comics, cartoons and movies. As a general rule, the comics claim that The Flash is the faster hero, with Barry Allen, Wally West and even an octogenarian Jay Garrick having outrun Superman over the years.
So in speed it's safe to assume that superman, at his peak, is faster. However, this is irrelevant because if they are fighting at post light speeds they wouldn't have a physical form or least not a tangible one.
In the comics, Godspeed is a few notches faster than Barry Allen as shown in the above photo where he struggled to keep up with him. The only way Barry was able to stop the villainous speedster was to "short-circuit" both their connections to the Speed Force, which temporarily cuts off their super speed.
Captain Atom has proven in past battles that he is stronger than Superman and has better fighting skills. He can also weaponize red sun radiation, which can weaken Superman like Kryptonite and magic. His sometimes uncontrolled nature has earned him a reputation as one of the most dangerous DC heroes.
Shazam can fly at the speed of light, which makes him faster than almost any other hero, but both Barry Allen and Wally West are able to move at speeds faster than light, meaning that while they would have to push themselves, at least two Flashes are faster than Shazam.
In All Star Superman,He lifted 200 freaking quintillion tons with one hand & still they didn't get an upper limit of his strength yet which means his strength is theoretically limitless.
While Superman could potentially overpower Thor, blows rendered by the mystical Mjolnir would likely impose serious damage on the Kryptonian hero. With his super-speed, the Man of Steel could probably avoid the Thunder God's lightning, but not necessarily, since Thor is just as fast.
In all instances of racing The Flash, Superman has never bested him, and throughout the entire history of DC comics, these two heroes have drawn twice. The Flash has bested Superman on two occasions so far.
He began fatally draining the ability of other speedsters in order to make himself stronger, and using this speed to make himself judge, jury and executioner of other criminals in Central City, aiming to avenge his brother's murder by any means necessary.
If it really took him 0.00001 microseconds, this meant the Flash traveled 2.5 quintillion miles per hour -- or roughly 3.7 trillion times the speed of light. This means that Wally West traveled 111 million times FASTER than Goku as of the Buu Saga, based on their maximum recorded speeds.
Despite his small appearance, Sonic the Hedgehog has a max speed of 186,000 miles per second and travels at a speed of 767 miles per hour. His light-speed shoes allow him to run faster than the speed of light and fight the evil genius who wants to use him in an experiment.
Godspeed would work alongside the likes of not only the Flash, but also Eobard Thawne, to stop Paradox from erasing the Flash from history. When asked by August if he knew who killed his brother, Thawne replied that it was in fact him who had killed his brother - before easily breaking Godspeed's neck, killing him.
The idea that God can travel faster than light is a concept that is often found in religious texts and mythology, but it is not something that can be scientifically proven or disproven.
Given this premise, in a straightforward one-on-one physical battle, Saitama, aka One-Punch Man, would likely emerge as the victor, as his power is portrayed as limitless and invincible.
While Thanos might have the brute strength to defeat Thor, for example, it's a different matter when it comes to the Big Blue Boy Scout. That's because Superman remains much more powerful than Thanos — meaning that, in a straight fight, the former is bound to take the latter down.
The whole story, and in fact both their entire histories together until now, enforce the idea that Superman is a being of many talents, but the Flash will always be the faster hero. But unfortunately for the Flash, there's one thing you can always count on Superman to do when it absolutely matters most: the impossible.
