how long before you can fly after a dvt?
<answer> More than 4 hours <context> After the flight. If you have travelled by air you should be alert for the symptoms of DVT for up to one month after flying, and should seek medical help if any symptoms such as a swollen or painful leg, especially the calf, and/or breathing difficulties occur.Last Reviewed: 12 October 2009.ir travel and the risk of DVT. An ongoing investigation by the World Health Organization (WHO) — WHO Research Into Global Hazards of Travel (WRIGHT) Project on Air Travel and Venous Thromboembolism — has found that the risk of DVT approximately doubles after a long-haul flight (more than 4 hours).