Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 09:00 and arrives at Singapore Changi Airport at 12:05.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 405 Km. So the average speed is roughly 194 Km.
There is an 1 hour time difference between Ho Chi Minh City and Singapore