Brief Answer: Yes Detailed Answer: Hi and thank you so much for this query. I am so sorry to hear about your battle with vasculitis. It is safe to make the trip. Because vasculitis increases the risk of clots formation, it would be advisable to do some in flight exercise like walking, flexing and extending the knees while sitting , so as to avoid being immobile for long. Also, try to stay well hydrated by consuming enough fluids. By so doing you would be reducing the risk of formation of a clot. I hope this addresses your query fully. Feel free to ask for clarifications and more information if need be. I wish you well. Thanks for utilizing our services, we very much appreciate it. Dr. Ditah, MD.