Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 19:30 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 22:00.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 1734 Km. So the average speed is roughly 495 Km.
There is an 1 hour time difference between Taipei and Ho Chi Minh City