Air distance from Washington DC, USA to Hanoi, Vietnam is 8318.7 Miles (13387.6 Kilometers / 7223.9 Nautical Miles).
17 hrs, 16 mins is the flight duration between Washington DC and Hanoi. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.