Flight International Airport departs from Doha International Airport at 09:30 and arrives at Kathmandu Tribhuvan International Airport at 16:45.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 3758 Km. So the average speed is roughly 884 Km.
There is an 3 hour time difference between Doha and Kathmandu
