How long of a flight can cause blood clots?

Most information about blood clots and long-distance travel comes from information that has been gathered about air travel. However, anyone traveling more than four hours, whether by air, car, bus, or train, can be at risk for blood clots.



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DVT or PE may manifest during or shortly after the flight, but often not for several weeks. Prevention includes choosing aisle seating, maintaining hydration, walking frequently, wearing loose clothing, exercising the lower extremities, using a foot rest, and avoiding alcohol and sleeping pills.

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Most people don't need to worry much about clots on short flights. But if you're already at risk for clots and you plan to take a plane trip that's longer than 6 hours, you can do a few things to avoid them. Get up and walk around every 2 to 3 hours.

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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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Remember that anything over 6 hours flying time is considered long haul, but flights of longer than 10 hours are not uncommon either. One important thing to remember is to keep your seat belt fastened at all times in case of unexpected turbulence.

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Compression socks may help. Whether you find yourself on a flight or a long car ride to visit family, compression garments for the legs can help prevent swelling, potential blood clots, and the general discomfort that comes from extended travel.

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However, anyone traveling more than four hours, whether by air, car, bus, or train, can be at risk for blood clots.

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Even in those with risk factors, DVT is uncommon on flights of less than 6 hours. Inactivity during a flight may be as important as distance flown and is more important than the class of travel; sitting in a window seat versus an aisle seat and sleeping during the flight increases risk.

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Wear loose clothing and bring a neck pillow, eye mask and noise-canceling headphones. I prefer in-ear headphones. Your risk of developing deep vein thrombosis is significantly higher on long-haul flights. Not moving for more than 10 hours can cause a deadly blood clot.

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How to survive a long-haul flight: 10 proven tips
  1. Find comfortable clothes to wear on long flights. ...
  2. Reserve a good seat. ...
  3. Prepare yourself for sleep. ...
  4. Don't pack too much in your cabin luggage. ...
  5. Take your own snacks. ...
  6. Move around the plane. ...
  7. Stay hydrated. ...
  8. Relax!


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Remember that anything over 6 hours flying time is considered long haul, but flights of longer than 10 hours are not uncommon either.

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