Flight International Airport departs from Doha International Airport at 10:30 and arrives at Kathmandu Tribhuvan International Airport at 17:30.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 3758 Km. So the average speed is roughly 940 Km.
There is an 3 hour time difference between Doha and Kathmandu
The best day to arrive at Doha is Tuesday and it would be best to avoid Saturday, as prices are on average 296.89% higher than on Tuesday. (Average prices, based on 195460 datapoints.)
We have a lot more statistics for flights QR 644 and between Doha and Kathmandu.