Well if no clips of her actually flying have been shown, people can't be wowed yet!
For now, we have only seen her battle against humans in her solo movie, but from what Patty has said, we also know that she adapts to her opponent's power level, it may be her personal belief that one must not over-kill your opponent especially when there are other solutions, like for example just hurt them really bad, bad enough to be incapacitated.
I know you want it so bad that she just would have to speedblitz normal humans in combat, but maybe she just loves to do all those crazy moves? Who knows!
She is yet to discover the extent of her powers in the solo movie, so yeah, if she is bound to fly, that may be by the end of the movie when she can finally unleash her full powers against a god.
Now I know some might say "that ain't no feat to kill Ares since that's what she was designed for", okay, then I would also ask : Why wasn't Zeus or any of the other gods able to kill Ares back then? If they can create a whole race capable of neutralizing a god and finally create 1 being capable of killing that god, then why aren't they themselves able to do so?
Still nothing about her flying abilities yet. Other heroes seem to have their powersets intact, or have even more than what is shown in the comics, yet Wonder Woman is still the same....an inconsistent powerset that varies from reboot to reboot to animated movies and now her own live action one.
That power wave thing is actually an addition to her powerset as it is, because she doesn't use it in the comics, not that way!
There are few accounts of her banging her bracelets together, but it was never to the extent of being able to create a wave of energy at will.