Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
I had a bilateral PE with lung infarction last May. In July I was allowed to fly 3 hours each way (my trip was two weeks long). I was two months out at the time.
I was on Acenocoumarol (Coumadin) with a highly unstable INR. I had to take heparin shots before flying as an added precaution.
Provided that you move a lot during the flight, I think there should not be any issues.
My doctor recommended some exercises with my legs during flights, they are pretty similar to those explained in the link: http://www.livestrong.com/article/315242-exercises-to-stop-your-legs-from-clotting-on-airline-flights/
Have a safe trip!
I fly several times a year. I'm on warfarin for life, but still make a point to get up and walk around 1-2 time a flight. I also try to stay hydrated and I'll wear my stockings on longer flights.
Keep in mind that the problem is not that you're on an airplane... that in itself doesn't cause clots. Usually clots are caused by someone remaining immobile, squished into a little seat, and not moving for hours. And you know enough to prevent that.