Superman can travel 186,000 miles per second, and if needed he can travel at a speed thousand times higher than that. Superman's reaction time is less than 1 attosecond, which is 1×10−18 of a second.
Back in the 1930s, Superman's flying speed was somewhere around 100 mph. This is ridiculously slow when compared to the current portrayals. According to various sources, he travels at least as fast as the speed of sound – which is somewhere in the region of 770 mph.
These days, Superman is depicted as being able to move faster than light, usually when he's flying outside of Earth's atmosphere. This means that Superman can move faster than 186,000 miles per second.
How fast is Superman? Superman is immensely fast, in fact, Superman and Flash are considered the fastest men in DC, Superman far exceeds the speed of light. The yellow Sun allows Superman to move at unlimited speeds.
They calculated his speed at at 296 mph, so consider that a lower bound.
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.
The Flash Has Always Been Faster Than Superman
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.
In the series Flash Forward, it was determined that Wally West is the fastest being in the whole Multiverse.
Superman can technically fly faster than the speed of light outside of Earth's atmosphereOpens in new tab, but at the end of the day, he's always going to be a little bit slower than everyone's favorite Scarlet Speedster.
This difference in gravity allows Superman to lift objects that measure in the tons. In fact, the comics have put Superman's strength at a point where he's able to lift around 2 billion tons! To put that into perspective, the Empire State Building is only 365,000 tons!
Generally, the Speed of Mercury allows Shazam to move “as fast as bolts of lightning.” The average speed of lightning is 270,000 mph (according to the first google result at least), which means that Shazam can easily reach speeds of 270,000 mph.
He possesses the ability to achieve speeds faster than light. While not as fast as the Flash, Superman can move at speeds faster than light.
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.
If Superman had no weaknesses at all, no Avengers would have a chance in front of him. While Superman is known for his incredible strength, speed, and other superhuman abilities, there are a few Avengers who could potentially give him a run for his money.
Online consensus suggests Spider-Man has an upper limit of 200-250 miles per hour. To put that in perspective, sprinter Usain Bolt's record is just under 28 miles per hour. Spider-Man's speed has fluctuated over the years greatly depending on the creative team writing him.
This super-fast superhero can make thousands of calculations in an instant. 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.
The Speed Force is a potent power source, allowing them to break the laws of physics in ways that Superman just can't. Superman is faster than a speeding bullet, but the Flash is speed personified. The Man of Steel's advantages are meaningless before the Flash's speed specialization.
According to Max Mercury one touch from the Black Flash, can cause instant death. Superhuman Speed: The Black Flash can move at vast superhuman speeds, easily keeping up with Barry Allen, and surpassing the speed of light.
Each of them redefined the word "hero." The mysterious power known as the Speed Force is an energy field that has, over the centuries, granted incredible powers of velocity to certain heroes. The most famous of these is the Flash, also known as the Fastest Man Alive.
Wally West is the Fastest Flash and is arguably the fastest being that has ever existed, as said by Max Mercury—and it has been remarked that Wally and Barry are the only two speedsters that were fast enough to even outrun death itself.
Superman is immortal as long as he stays exposed to the yellow sun. Yellow Sun radiation is a prime source of power for Superman, and due to its effects, he is practically invulnerable to most forms of damage, and he is able to live seemingly forever. That doesn't mean that Superman can't be killed, however.