Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 18:20 and arrives at Hong Kong Hong Kong International Airport at 22:05.
The flighttime is about 2h 45m. The distance travelled ("as the bird flies"): 917 Km. So the average speed is roughly 333 Km.
There is an 1 hour time difference between Ho Chi Minh City and Hong Kong