31 weeks pregnant, ok to fly?

Cassandra • 26 years old. First pregnancy and I can't wait till Jan. 19th!
Haven't talked to my doc yet but from others is it ok to fly at 31 weeks? So far I'm having a healthy pregnancy. Everything's on track and in order. It's only a 2 hour flight. And if I get the ok is it uncomfortable? Tips for having an easy pregnancy flight?