londonblue,
I broke my ankle over 20 years ago and I have to confess that it didn't even occur to me to report it.
I was in a non-weight-bearing cast for eight weeks (bi-lateral fracture of the base of the tibia and spiral fracture of the fibula). I remember at the time, not being able to imagine putting any weight on it. After the cast was removed, I had another two-months of physio.
All of this was in the winter in Canada (I slipped on some ice) and my gliding club was shut down, so there was no chance of flying anyway.
However, as others have said, if you can walk comfortably and drive, I don't think flying will be an issue.