The best month to fly between Delhi and Mumbai is August and the most expensive month to fly is June. (Average prices, based on 593 datapoints.)
The best day to arrive at Delhi is Sunday and it would be best to avoid Tuesday, as prices are on average 51.62% higher than on Sunday. (Average prices, based on 6499326 datapoints.)
The cheapest airline flying from Delhi to Mumbai is Spicejet. They are 14% cheaper than Air India. (Average prices, based on 611 datapoints.)