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While All Might in My Hero Academia is suffering from some significant ailments which restrict him from functioning at optimum speed, the prequel manga My Hero Academia Vigilantes shows that All Might was shockingly swift when he was in better health (though still injured). In chapter 54, All Might covers several kilometers in a few seconds from Might Tower to Naruhata. In chapter 123, All Might is shown to move so quickly that afterimages would suggest several All Mights dashing about.
Even in My Hero Academia proper, All Might—despite his injuries—is an extraordinarily quick hero. All Might speeds from the building's doorway to the villains and incapacitates them faster than you could blink in the USJ incident of the main manga. All Might could reach from the hideout to All for One's position in less than a minute, so quick that the criminals had just begun teleporting when he arrived. All Might's natural ability to use One for All to enhance his body helped him to attain some quite incredible speed.
Deku, for his part, moves largely at speeds that, although remarkable, don't particularly strike out at first view. Still, one of Deku's best speed runs is from the Dark Hero storyline. Seeing Lady Nagant change her aim from himself to the unarmed Kai Chisaki (Overhaul), Deku uses One for All's power at 45% to mix with Fa Jin's to move at speeds allowing him to outrace Nagant's bullets, therefore sparing Chisaki's life. Although Deku says this was one most notably accomplished by All Might, once he solved this he was able to avoid more shots from her.
Deku's speed is far higher from now on, which lets him maneuver and dodge really naturally. Deku was able to outmaneuver Overhaul repeatedly using 100% of One for All's power with Eri's help, producing afterimages much like All Might did. Deku's agility is one of his strongest suit; it lets him go past challenges even at quite high speeds. This was partially owing to Danger Sense, which would let him respond faster than most because of the forewarnings it gave him.
Tenya Iida's Quirk lets him move at a shockingly quick speed since engines are buried in his legs. Iida has progressed significantly, going through a radical process that replaced his mufflers with more potent versions and increasing his speed even in the quite short period the story spans. At one point, Iida was claimed to be even faster than Gran Torino, the mentor for All Might, who can bounce from place to place at speeds faster than the eye can track.
Recipro Turbo's final action will allow Iida to exceed his restrictions for up to ten minutes, accelerating even faster than before was feasible. Grabbing Deku's friend's hand as he walked by to comfort him he wasn't alone, Iida famously utilized this to catch up with him during the Dark Hero storyline. With his "maximum speed," Iida even gets to beat this in the manga, therefore establishing a strong case for him as the Fastest Hero on Earth. Iida used full speed to assist Shoto Todoroki in covering less than 10 minutes—more than twice the speed of sound—all the way from Kamino to Gunga (from Yokohama to Kyoto, over 430km).
Regarding who among these heroes is the ultimate fastest, it's rather a tough question. Although All Might and Deku may attain shockingly high top speeds, Deku at least cannot sustain these speeds very long. Deku likewise needs some preparation to reach his best speed since Fa Jin needs repeated motions to completely realize its potential. Given his endurance, the type of Quirk he possesses, and how good he is on level ground, Iida would most certainly win in a footrace between the three characters. Iida lacks maneuverability, but Deku's area of expertise and something All Might personally was really adept at.
Practically speaking, All Might in his prime is perhaps the fastest of these three; he can resolve events in a few seconds by launching himself forward with such force and accuracy. With the exception of All for One, who has never truly shown off any speed-enhancing Quirks, no villain has ever been able to match All Might's force and speed. Even while All Might rapidly disarms thugs and leaves them helpless for the police, his stamina—at least prior to his injuries—is also remarkably high, allowing him to move from incident to incident at a blinding pace.
One of the amazing powers a Quirk can bestow is moving at extraordinarily high speeds; my Hero Academia features certain heroes with just this ability. But among the heroes in My Hero Academia, who among them is the fastest of all? It's difficult to say without actual statistics, but by contrasting the exploits of some of the Fastest Heroes—like Iida, All could, and Deku—an answer just could surface.
Unlike its Western superhero cousins, the universe of My Hero Academia lacks a lot of speedsters. Tenya Iida, sometimes known as Ingenium, is the only figure that really would fit that description, and he does have some quite remarkable speed. But All Might was known to move from city to city with amazing speed in his time, and Deku has shown to be no slouch when it comes to using One for All's might to accelerate quickly.
All three of My Hero Academia's quickest heroes are capable of some quite amazing speed that qualifies them for admiration, even when All Might may come out on top in a pragmatic scenario.
The multimedia series My Hero Academia centers on a teenage lad named Izuku Midoriya, who, despite birth without superpowers, aspires of being a hero. Most people have these superpowers, sometimes referred to as "Quirks," but Izuku was not so fortunate; until he meets Japan's greatest hero, All Might, Izuku inherits his Quirk and starts U.A. High School to discover the true meaning of heroism. Along with his friends, each with special skills, Izuku undergoes intense training and deadly threats from wicked agents.