Summary. In a recent DC Comics storyline, Superman achieves an unimaginable speed by flying through yellow suns, surpassing the Flash's famous Speed Force. The Flash's Speed Force actually hampers him in this situation, as moving too fast can trap him in the dimension that gives him his power.
While not every Flash could beat Superman in a no-holds-barred race, the main Flashes — Barry Allen and Wally West — have both beaten Superman in several contests of speed. The Speed Force is a potent power source, allowing them to break the laws of physics in ways that Superman just can't.
It's been proven by now that Superman can't outrun the Flash, but it turns out he's still fast enough to keep up with Flash's top speed - albeit barely.
Summary. Shazam's speed has been officially revealed to be Mach 50, making him 50 times faster than the speed of sound, a downgrade from his previous top speed. When compared to other DC heroes, Shazam is no match for the likes of The Flash, Superman, Supergirl, Wonder Woman, and Green Lantern.
It is said that The Flash can run 13 trillion times faster than the speed of light, which would mean that he can travel up to 1,750,000,000,000,000,000 miles per second. The Flash gets his incredible speed and abilities from The Speed Force.
Superman can run and think fast, he just doesn't come close to The Flash's top speed. 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.
In the past, Wally handily won every race against Superman, but he was also facing the weaker post-Crisis Superman. Current Superman is much more powerful, and his control of spacetime means his running speed is no longer by how fast he actually he is.
When necessary, Goku has been faster than The Flash, but it's the source of The Flash's powers, and his years spent mastering the way he and his enemies respond to speed, that holds his best weapon.
This also tracks very well with Flash Rebirth #3 where Barry Allen admits there were times he'd let Superman win on purpose whenever they raced for charity in the past. The Flash is the Fastest Man Alive, and that includes being faster than Kryptonians.
In the Crisis on Earth X crossover, when supergirl claimed that superman would hunt down the New Reichsmen(nazi justice league of earth x) Reverse Flash responded that he met and fought Superman. He added "he's fast, I'm faster" implying Superman's defeat. Superman is in another earth and another timeline from eobard.
During the 'Flash War' run, Barry was shown to not be able to keep up, he told Wally that he couldn't keep up, and after the story line ended, he confirmed again that Wally was faster.
As mentioned earlier, Barry and Wally do completely outclass Superman together in the Flash War arc and there a few races with results we can't be sure of, such as in the Superman: The Animated Series episode “Speed Demons” and issue #7 of the Rebirth-era Titans series.
As Flash runs after his target, he reflects on how fast he is, especially compared to Superman. Barry confirms that on the ground, he is indeed faster than Clark because Flash can do things Superman is unable to do, such as being able to vibrate his molecules and phase through solid objects.
In terms of speed, power, and durability, Superman and Goku (in SSJ2) are pretty much even. However, Goku's martial arts training gives him an edge against Superman. Superman might have gotten some training as well, but it has not been covered or written about as extensively as Goku's. I would say it is about 50-50.
It's this power that allows Flash to defeat the villain Darkseid and his best-known device to attain power, the Anti-Life Equation. In Justice League Infinity #7, the story begins with the Justice League - or rather, what's left of them - in dire straights.
He can travel through space unharmed and can summon powerful bolts of lightning with his indestructible enchanted hammer. The Flash may be able to escape harm for a bit, but in the end, Thor would be too strong for the Flash to withstand.
Gogeta: The best person we can scale to is Whis' speed, which is about 72 quadrillion times the speed of light, when compared to the Flash it is nowhere near that speed where Barry can theoretically move at speeds of 11.8 quintillion times light, making Flash about 160 times faster than Goku, if we wank Goku to Whis' ...
There's no question the Hulk is a near-indestructible force who comes out on top in almost all of his battles of pure strength. However, against Superman, he's outmatched. While Hulk's strength might rival that of the Man of Steel, Superman's other abilities give him a considerable edge against his opponent.
Hurting the Hulk would be hard for the Flash, especially since every missed attack would make the Hulk angrier. However, the Flash can always deploy the infinite mass punch, his most devastating attack. It would be a last resort but it would give the Flash the win.
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.
While it is fairly obvious that the Flash could run circles around Thanos under normal circumstances as his powers make him virtually untouchable, there wouldn't be much the Scarlet Speedster could do if he was around for Thanos' Infinity Snap as there is no way to outrun the god-like power of cosmic chance.
While it is confirmed that Superman is slower than the Flash, this moment proves that his powers are on par with the Speed Force. It is even possible that once he has properly adjusted to the speed, he will be able to go faster than them.
Shazam is much stronger and more durable. He has a multitude of ways to incapacitate the Flash. Many of Flash's best attacks are lethal and likely could and would not be used. Shazam is not as fast as Flash but once Flash is tired, it's over.
