Flight Beijing Capital International Airport departs from Beijing Beijing Capital International Airport at 15:30 and arrives at Hanoi Noi Bai International Airport at 18:30.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 1405 Km. So the average speed is roughly 351 Km.
There is an 1 hour time difference between Beijing and Hanoi
