What is considered a long flight for blood clots?

Traveling longer than 8 hours, whether by plane, car, bus, or train, can increase risks for life-threatening blood clot. The risk of a blood clot is about 3-times higher for people traveling on long-distance flights.



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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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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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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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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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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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Loose-fitting clothing may be beneficial in avoiding constriction of veins. Some recommend taking short naps, instead of long ones, to avoid prolonged inactivity. If you have any of the risk factors for DVT, consult your physician before long trips.

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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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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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It has been well recognized that a hypercoagulable state exists when a person is exposed to high altitude environment. This may manifest as early thromboembolic episodes, which may result in deep vein thrombosis (DVT) or acute pulmonary embolism (PE), which is a potentially fatal condition.

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Graduated compression stockings or socks are usually recommended for flights that last longer than 3 hours, as this is when you will start to suffer physical health issues.

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