Flight Tribhuvan International Airport departs from Kathmandu Tribhuvan International Airport at 13:25 and arrives at Delhi Indira Gandhi International Airport at 14:50.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 917 Km. So the average speed is roughly 478 Km.
There is an 0.5 hour time difference between Kathmandu and Delhi