Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 08:20 and arrives at Nha Trang Cam Ranh International Airport at 09:40.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 644 Km. So the average speed is roughly 276 Km.
There is an 1 hour time difference between Guangzhou and Nha Trang