The best month to fly between Delhi and Kolkata is August and the most expensive month to fly is April. (Average prices, based on 556 datapoints.)
The best day to arrive at Delhi is Wednesday and it would be best to avoid Saturday, as prices are on average 62.95% higher than on Wednesday. (Average prices, based on 2473800 datapoints.)
The cheapest airline flying from Delhi to Kolkata is IndiGo. They are 16% cheaper than Air India. (Average prices, based on 563 datapoints.)
The best time to fly is at around 5. (Average prices, based on 826 datapoints.)