Flight Tribhuvan International Airport departs from Kathmandu Tribhuvan International Airport at 21:00 and arrives at Delhi Indira Gandhi International Airport at 22:55.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 917 Km. So the average speed is roughly 379 Km.
There is an 0.5 hour time difference between Kathmandu and Delhi
