Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 18:00 and arrives at San Francisco International Airport at 17:00.
The flighttime is about 14h 00m. The distance travelled ("as the bird flies"): 14703 Km. So the average speed is roughly 1050 Km.
There is an 15 hour time difference between Ho Chi Minh City and San Francisco