Magic is mostly physics. I bet you didn’t know that.
Want to fly? You could transform yourself into an eagle or a hawk, of course, if you want to be prosaic. But that takes a lot of juice, and you’re not going to be able to cast another spell for a few days, so get used to being an bird for a while.
The smart wizard simply creates an area of low inertial resistance around his body, and then jumps into the air. After that, he steers by making the resistance greater on one side or another. Efficient and effective.