Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 15:50 and arrives at Chiang Mai Chiang Mai International Airport at 17:50.
The flighttime is about 3h 00m. The distance travelled ("as the bird flies"): 1599 Km. So the average speed is roughly 533 Km.
There is an 1 hour time difference between Guangzhou and Chiang Mai