I'm 11 weeks and traveling to Japan and in two weeks to Australia...long flights and doctor said it was ok
My dr gave me the ok to fly at 24 weeks with twins. She said to make sure to stay hydrated and when the seatbelt sign is off get up and stretch to avoid swelling.
At 35 weeks I traveled driving though and my doctor gave me the ok. But since you are flying I would call your doctor to make sure.
Are you thinking of driving?