The best month to fly between Kolkata and Mumbai is September and the most expensive month to fly is May. (Average prices, based on 582 datapoints.)
The best day to arrive at Kolkata is Wednesday and it would be best to avoid Tuesday, as prices are on average 85.4% higher than on Wednesday. (Average prices, based on 257325 datapoints.)
The best time to fly is at around 20. (Average prices, based on 747 datapoints.)