With varying routes and stopovers, the duration of flights normally ranges between 17 to 20 hours for Washington D.C. to Hanoi, Vietnam. Besides usual stopovers, nonstop flights are not very common, and there'll ensue a total travel time, which is quite long. It is typically safe to call the airline to check current schedules-a great tip to keep in mind.
The flight duration from Washington D.C. ( Dulles International Airport - IAD) to Hanoi (Noi Bai International Airport - HAN) is approximately 15-16 hours, depending on the specific airline and any layovers. Keep in mind that there will be a significant time difference between the two cities due to the different time zones, with Hanoi being roughly 12 hours ahead of Washington D.C.
Flight time from Washington, D.C. (DC) to Hanoi, Vietnam (HANO) is typically around 12-14 hours. This includes direct flights from Washington, D.C. Dulles International Airport (IAD) to Hanoi International Airport (HND).