How many people get blood clots after flying?

One study estimates that 1 in 4,600 travelers will have a blood clot within 4 weeks of a long flight. According to Dr. Kahn, “the actual risk of a travel-related blood clot is quite small, and the average traveler doesn't need to worry about it.



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Even if you travel a long distance, the risk of developing a blood clot is generally very small. Your level of risk depends on the duration of travel as well as whether you have any other risks for blood clots.

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Blood clots affect about 1-2 in 1,000 U.S. adults per year, and the risk may double or triple after a flight that's 4+ hours. One study estimates that 1 in 4,600 travelers will have a blood clot within 4 weeks of a long flight.

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Prevent Blood Clots During Travel
  1. Stand up or walk occasionally. ...
  2. Exercise your calf muscles and stretch your legs while you're sitting. ...
  3. Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots.


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Increasing leg muscle activity during long periods of sitting improves blood flow in the legs. This may include walk- ing around the cabin or exercising your lower legs and ankles while seated. Drinking adequate fluids, and avoiding alcohol and caffeine, may also help by preventing dehydration.

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DVT is a potentially life threatening condition in which a blood clot forms in a deep vein, most commonly in one of the legs. These clots can break off and travel to the lungs, where they can be fatal. Flying for long distances seems to aggravate the condition, but there are steps pilots can take to lower their risk.

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The FAA accepts most anticoagulants including aspirin, Coumadin (warfarin), Pradaxa (dabigatran), Xarelto (rivaroxaban), or Eliquis (apixaban). Coumadin has been around a long time, and is a somewhat difficult drug to manage for several reasons.

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