Flight Tribhuvan International Airport departs from Kathmandu Tribhuvan International Airport at 23:00 and arrives at Doha International Airport at 01:15.
The flighttime is about 5h 15m. The distance travelled ("as the bird flies"): 3758 Km. So the average speed is roughly 716 Km.
There is an 3 hour time difference between Kathmandu and Doha
The best day to arrive at Kathmandu is Thursday and it would be best to avoid Saturday, as prices are on average 118.5% higher than on Thursday. (Average prices, based on 92049 datapoints.)
We have a lot more statistics for flights RA 239 and between Kathmandu and Doha.