Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 10:55 and arrives at Hong Kong Hong Kong International Airport at 14:00.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 902 Km. So the average speed is roughly 433 Km.
There is an 1 hour time difference between Hanoi and Hong Kong