Why do my legs ache after long flights?
Last updated September 3, 2026.
Hours of sitting slow the calf pump, fluid pools, and joints stiffen, so you land with heavy, aching legs and swollen ankles. Normal post-flight ache is both-sided, diffuse, and gone within a day of moving, hydrating, and sleeping. Hourly aisle walks, calf raises, water, and compression socks prevent most of it. The line that matters is symmetry: the NHS describes DVT as throbbing pain, swelling, warmth, and redness in one leg, usually calf or thigh, needing prompt medical help, and sudden breathlessness or chest pain after a flight as an emergency. Previous DVT, pregnancy, recent surgery, and clotting conditions raise the stakes.
What to do
- Walk hourly and do seated calf raises and ankle circles.
- Hydrate through the flight and consider compression socks.
- Move normally the day after; walking clears the stiffness fastest.
- Get urgent help for one-sided calf or thigh pain, swelling, warmth, redness, or any breathlessness or chest pain.
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