Flight International Airport departs from Doha International Airport at 09:20 and arrives at Kathmandu Tribhuvan International Airport at 16:45.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 3758 Km. So the average speed is roughly 851 Km.
There is an 3 hour time difference between Doha and Kathmandu
The best day to arrive at Doha is Sunday and it would be best to avoid Monday, as prices are on average 132.11% higher than on Sunday. (Average prices, based on 117674 datapoints.)
We have a lot more statistics for flights QR 646 and between Doha and Kathmandu.