Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 06:50 and arrives at Singapore Changi Airport at 10:15.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 405 Km. So the average speed is roughly 168 Km.
There is an 1 hour time difference between Ho Chi Minh City and Singapore