Also depends on the hospital policy.
I wasn't booked for a section until 40+1 with DS as they wanted as close to EDD as they could. And, they knew he was bigger (4.1kg at birth at 39weeks).
With DD2 she was a pregnancy after dehiscence (my previous scars broke down). She was delivered at 38 weeks, but we had had scar scans. With her we really couldn't risk a labour.