Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 01:20 and arrives at Osaka Kansai International Airport at 08:30.
The flighttime is about 5h 10m. The distance travelled ("as the bird flies"): 3399 Km. So the average speed is roughly 658 Km.
There is an 2 hour time difference between Ho Chi Minh City and Osaka