Flight Tribhuvan International Airport departs from Kathmandu Tribhuvan International Airport at 16:35 and arrives at Kunming Wujiaba International Airport at 22:05.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 1932 Km. So the average speed is roughly 552 Km.
There is an 2 hour time difference between Kathmandu and Kunming