How common is DVT after flying?

Factors that contribute to the increased risk of travel-related DVT include obesity, extremes of height, use of oral contraceptives and pre-existing blood clotting abnormalities. The absolute risk of DVT in healthy passengers per long-haul flight (more than 4 hours) was found to be about 1 in 6000.



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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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?Preventive Measures
  1. Move around as much as possible.
  2. Choose an aisle seat where feasible as this is known to encourage moving around during the journey .
  3. Carry out calf muscle exercises: ...
  4. Try to avoid placing cabin baggage where it can restrict your leg movement.


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Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots. Taking aspirin to prevent blood clots when traveling is not recommended.

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Summary. Pilots should be aware of the potential increased risk of DVT associated with air travel. Several easy to follow guidelines should minimize any increased risk.

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Research has shown that wearing compression socks during long-haul flights can significantly reduce the risk of developing blood clots and alleviate symptoms of leg fatigue and discomfort.

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