Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 02:00 and arrives at Colombo Bandaranaike International Airport at 05:05.
The flighttime is about 5h 35m. The distance travelled ("as the bird flies"): 3684 Km. So the average speed is roughly 660 Km.
There is an 2.5 hour time difference between Guangzhou and Colombo
