Flight Gimhae International Airport departs from Busan Gimhae International Airport at 08:00 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 11:40.
The flighttime is about 5h 40m. The distance travelled ("as the bird flies"): 2736 Km. So the average speed is roughly 483 Km.
There is an 2 hour time difference between Busan and Ho Chi Minh City