Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 21:15 and arrives at Melbourne Avalon Airport at 09:25.
The flighttime is about 8h 10m. The distance travelled ("as the bird flies"): 4976 Km. So the average speed is roughly 609 Km.
There is an 4 hour time difference between Ho Chi Minh City and Melbourne