Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 23:50 and arrives at Bangkok Suvarnabhumi Airport at 02:00.
The flighttime is about 3h 10m. The distance travelled ("as the bird flies"): 1426 Km. So the average speed is roughly 450 Km.
There is an 1 hour time difference between Guangzhou and Bangkok
