Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 03:00 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 05:35.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 1733 Km. So the average speed is roughly 671 Km.
The best day to arrive at Mumbai is Wednesday and it would be best to avoid Friday, as prices are on average 109.63% higher than on Wednesday. (Average prices, based on 624503 datapoints.)
We have a lot more statistics for flights 6E 138 and between Mumbai and Kolkata.