Flight Perth Airport departs from Perth Perth Airport at 11:20 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 16:50.
The flighttime is about 6h 30m. The distance travelled ("as the bird flies"): 1952 Km. So the average speed is roughly 300 Km.
There is an 1 hour time difference between Perth and Ho Chi Minh City