On a long flight, a practical target is to stand or walk briefly every one to two hours when it is safe, while also moving your ankles and calves in your seat. No interval can guarantee prevention of blood clots, so higher-risk travelers still need individualized medical advice.
Simple movement plan
- Stand or walk periodically when the seatbelt sign is off.
- Use ankle pumps and calf contractions between walks.
- Avoid staying completely motionless for many hours.
- Consider an aisle seat if frequent movement is important to you.
- Ask a clinician about extra prevention if you have major clot risk factors.
Why movement matters
Long periods of sitting slow blood flow in the legs. This is one reason long-distance travel is associated with a small increased risk of deep vein thrombosis, especially in people with additional risk factors.
What if you cannot get up?
Move your ankles, flex and point your feet, tighten and relax the calf muscles, and change position regularly. These simple movements are not a substitute for medical prevention in high-risk travelers, but they are easy ways to avoid staying completely still.
Who is at higher risk?
Risk can be higher with previous blood clots, recent surgery, active cancer, pregnancy, estrogen-containing medication, significant immobility and some clotting disorders. People at higher risk should ask a healthcare professional about individualized prevention before travel.
Compression socks
Graduated compression stockings may be recommended for some travelers. Fit matters, and they are not appropriate for everyone. See our compression socks for long flights guide.
Simple rule
When the seatbelt sign is off and it is safe, stand or walk periodically and avoid sitting motionless for many hours. If you develop one-sided leg swelling, pain, chest pain or sudden shortness of breath after travel, seek urgent medical care.
Frequently asked questions
Is walking every two hours enough?
It is a practical routine for many travelers, but there is no guaranteed interval. Combine periodic walking with seated leg movement and consider your individual risk factors.
What exercises can I do without leaving my seat?
Try ankle pumps, ankle circles and repeated calf contractions. See our long-flight circulation exercises.
Who should speak with a clinician before flying?
People with a previous clot or other important risk factors should ask about individualized prevention before long-distance travel.
Related guides: reduce swelling during a long flight and stay hydrated on a long flight.
How to build movement into the flight
Instead of waiting until your legs feel very stiff, make movement part of the normal rhythm of the journey. Walk to the restroom when you need to, stand briefly near your seat when the aisle is clear and use seated calf movements between opportunities to get up. A reminder on your phone or watch can be useful if you tend to lose track of time while watching films or working.
You do not need to walk for long periods. A brief change of position and a few minutes of gentle movement can break up a long block of sitting.
Window seat versus aisle seat
An aisle seat may make it easier to stand without asking other passengers to move, which can be helpful on very long flights or for travelers who know they need frequent movement. A window seat is still reasonable if you prefer it; simply use in-seat exercises more often and get up when practical rather than remaining seated for the entire journey.
What to do during turbulence or when the seat-belt sign is on
Safety takes priority. Stay seated and keep your seat belt fastened when instructed. You can still perform small ankle pumps, gentle circles and calf contractions without leaving your seat. Once the cabin is safe for movement again, resume brief walks when convenient.
Movement after the flight matters too
Long travel days often include additional sitting in airports, cars, trains and hotel transfers. Walking after landing helps you return to normal activity and may reduce ordinary stiffness and mild swelling. If you have a long connection, use some of that time to walk through the terminal instead of sitting at the gate continuously.
Do not rely on walking alone if your risk is high
For most healthy travelers, movement is a sensible general measure. People with major clotting risk factors may need a different prevention plan. Depending on the individual situation, a clinician may discuss compression stockings or other measures. Do not start medication for clot prevention on your own based only on a travel article.
A realistic long-flight routine
- Walk in the terminal before boarding.
- Keep the area around your feet clear enough for ankle movement.
- Perform seated calf and ankle exercises throughout the flight.
- Stand or walk briefly when it is safe and convenient.
- Use connections and arrival time as additional opportunities to move.
- Seek medical advice before travel if you have a previous clot or major risk factors.
Bottom line
There is no magic interval that eliminates travel-related blood-clot risk. For many travelers, getting up about every one to two hours when practical, combined with regular seated leg movement, is a useful routine. Safety instructions always come first, and people with important risk factors should use an individualized prevention plan rather than relying on a generic schedule.
Reference: CDC guidance on blood clots and travel.