Are blood clots common on long flights?

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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The links between travel and 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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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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Blood clots can form in the deep veins (veins below the surface that are not visible through the skin) of your legs during travel because you are sitting still in a confined space for long periods of time. The longer you are immobile, the greater is your risk of developing a blood clot.

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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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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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Prevent Blood Clots During Travel Select an aisle seat when possible so you can walk around every 2-3 hours.

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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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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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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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The following are the most common symptoms of DVT that occur in the affected part of the body (usually the leg or arm): Swelling of your leg or arm. Pain or tenderness that you can't explain. Skin that is warm to the touch.

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We conclude that there is currently no definitive evidence that air travel increases the risk of DVT. However, there is some evidence to suggest that flights of eight hours or more increase the risk of DVT if additional risk factors exist.

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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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There has been considerable attention focused recently on the risk of deep venous thrombosis (DVT) associated with air travel. Despite the lack of evidence among air travelers, a single dose of aspirin has been widely recommended as a means of preventing such thrombosis.

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