Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 01:40 and arrives at Osaka Kansai International Airport at 07:50.
The flighttime is about 4h 10m. The distance travelled ("as the bird flies"): 3339 Km. So the average speed is roughly 801 Km.
There is an 2 hour time difference between Hanoi and Osaka