Long-haul flight risk for serial clotter (DVT/PE) ?

Long flights cause a risk of DVT for anyone. The reason is that people will sit still for most of those hours and as the calf muscles are not flexing the valves in the veins do not get the force needed for strong return blood flow so blood can easily stagnate in the lower leg veins and allow clotting to occur. You can still take long flights but do prevention methods such as: get up and walk up and down the isle every couple of hours, or while sitting do flexing exercises by pointing toes sharply down towards floor then up towards your head, and wear compression stockings which help increase circulation back towards the trunk of the body. Your INR is in a good therapeutic range and your risk is indeed lowered, but highly recommend the previously mentioned preventative measures also be followed. Hope you have many safe flights and peace of mind.

The only thing I would suggest is avoid any foods with vitamin K such as spinach, kale, and green tea as these thicken the blood. I think they have special compressor socks which keeps blood from pooling in the legs, you can get these at medical / orthopedic supply stores.

You may also want to speak with a specialist at your anti-coagulant management service. Ask what your options are.