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He's 18 now which, I think, is canon for being able to fly. I know it's fanon at the very least, but I think it's canon.
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Ups, sorry, I think I am watching too much Smallville, where there is this stupid "No tights, no flights" rule. So teenage Clark and flying is a bit strange for me.

But yeah, I think it is canon in LnC for Clark to be able to fly at the end of high school.