Levitating is basically floating.

levitation users would need an outside force to move while flight users make their own force.

when you use levitation, you stay afloat and you cannot move and create a thrust out of nothing is like staying afloat, in some cases you can move through walls or objects by pushing yourself or you move slowly in the air, the flight creates a thrust when you want, it is plus a movement you can do in the air is not floating and just a movement beyond walking on the ground