Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 16:50 and arrives at Bangkok Don Mueang International Airport at 18:55.
The flighttime is about 3h 05m. The distance travelled ("as the bird flies"): 1440 Km. So the average speed is roughly 467 Km.
There is an 1 hour time difference between Guangzhou and Bangkok