Flight Tan Son Nhat International Airport departs from Ho Chi Minh City Tan Son Nhat International Airport at 08:00 and arrives at Xiamen Gaoqi International Airport at 12:00.
The flighttime is about 3h 00m. The distance travelled ("as the bird flies"): 1394 Km. So the average speed is roughly 465 Km.
There is an 1 hour time difference between Ho Chi Minh City and Xiamen