Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 00:35 and arrives at Osaka Kansai International Airport at 06:40.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 3339 Km. So the average speed is roughly 818 Km.
There is an 2 hour time difference between Hanoi and Osaka