Connor's Kryptonian powers have evolved over time. When he first appeared, he had tactile TK that mimicked a lot of Superman's powers, but he didn't actually have super-strength or flight abilities. As he's gotten older, his Kryptonian powers have kicked in. There's a nice segement during Johns' run on Teen Titans where the kids are arguing with their older counterparts and Connor's heat vision works for the first time and he accidentally burns Superman's cape.