I'm pretty sure, this has been asked before somewhere, but can't find it, so would really like to know, cause her flying seems really inconsistent (as is always the case with Wonder characters).

In her own book and in Superman/Wonder Woman, she hasn't been flying, but then in the JL book she has.

Like this page:

https://2.bp.blogspot.com/Q6ioOXCgSP...txJLBAVg=s1600