Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 23:35 and arrives at Tokyo Narita International Airport at 07:55.
The flighttime is about 6h 20m. The distance travelled ("as the bird flies"): 3981 Km. So the average speed is roughly 629 Km.
There is an 2 hour time difference between Ho Chi Minh City and Tokyo
