Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 09:35 and arrives at Doha International Airport at 12:55.
The flighttime is about 7h 20m. The distance travelled ("as the bird flies"): 6028 Km. So the average speed is roughly 822 Km.
There is an 4 hour time difference between Hanoi and Doha
