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Originally Posted by blankall
We really don't know anything about what gives Superman the ability to fly. Theoretically speaking, since he seems to generate some kind of forward propulsion on his own, in the vacuum of space he could reach unlimited speeds. Theoretically, once he breaks the speed of light, he then begins time travel. Although this is more disputed now, that was certainly the prevailing theory at the time Superman I was filmed.
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I've read conjecture that Superman uses theoretical exotic particles to defy gravity (gravitons) and propel himself. Because they only exist on paper and we don't know how these operate, some theoretical particles like tachyons are already FTL and can travel forward and backward in time. In the end, it's a comic book movie and you can explain everything away as Superman possessing powers that defy both physics and logic as we know it. He creates some kind of a time warp in Superman I (it's never said that he's actually breaking the FTL barrier or doing anything like that) and in Superman II he kisses Lois and mind-wipes her in the process. The Reeve movies just give him all sorts of wacky/stupid powers.