Saitama spent most of his life as a normal guy, until one day he chose to become a hero for fun and worked extremely hard to become strong. Now too strong that he can defeat his enemies with a single punch, life again was becoming too dull.
Immeasurable Strength: Saitama possesses an immeasurable amount strength and as a result is capable of destroying powerful monsters and villains with a single one punch (though this strength is not limited to punches).
Saitama from One-Punch Man has a top speed of 159,236 mph or 256,266 kph.
Saitama holded his breath because that’s what a normal human does. If a human enters space, the vacuum will put out your air and kills you even if you hold your breath. Saitama has surpassed human levels and can breathe in space but he doesn’t know it yet.Strange as it might sound, Saitama can’t actually fly even though it certainly seems that way to the audience. This is because his leaping skills are so over the top that he can effortlessly spring over buildings or ricochet his entire body off any incoming attacks or projectiles.Saitama was also able to match the speed of Flashy Flash. He can move faster than the speed of light.Can Saitama survive the sun? On top of that, Saitama was able to survive space without getting damaged by the sheer cold and by the radiation from the sun due to the fact that he is simply that strong. Saitama’s body is so strong that it has reached a level where not even outer space is hazardous enough for him.He is already pretty strong, and not even at full power. At 100% of his power, given a little rounding, he is about 4-A, Multi-Solar System level.Immeasurable Dexterity: Saitama is capable of moving any of his limbs at extremely fast speeds without even flinching, not stopping until his target is completely obliterated.This is because his appearance is going to be used as a plot point later. The big reveal is that when Saitama finally meets him, he will put two and two together and find out that Blast is his dad and Saitama powers has no limit.