Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 11:30 and arrives at Kathmandu Tribhuvan International Airport at 14:05.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1397 Km. So the average speed is roughly 671 Km.
There is an 0.5 hour time difference between Mumbai and Kathmandu