Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 20:10 and arrives at Kathmandu Tribhuvan International Airport at 22:55.
The flighttime is about 4h 45m. The distance travelled ("as the bird flies"): 3105 Km. So the average speed is roughly 654 Km.
There is an 2 hour time difference between Guangzhou and Kathmandu