Flight Tribhuvan International Airport departs from Kathmandu Tribhuvan International Airport at 14:40 and arrives at Bangkok Don Mueang International Airport at 19:15.
The flighttime is about 3h 35m. The distance travelled ("as the bird flies"): 1684 Km. So the average speed is roughly 470 Km.
There is an 1 hour time difference between Kathmandu and Bangkok
The best day to arrive at Kathmandu is Thursday and it would be best to avoid Tuesday, as prices are on average 26.06% higher than on Thursday. (Average prices, based on 177290 datapoints.)
We have a lot more statistics for flights RA 401 and between Kathmandu and Bangkok.