Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 08:45 and arrives at Kathmandu Tribhuvan International Airport at 11:45.
The flighttime is about 5h 00m. The distance travelled ("as the bird flies"): 3105 Km. So the average speed is roughly 621 Km.
There is an 2 hour time difference between Guangzhou and Kathmandu