Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 12:25 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 14:30.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1262 Km. So the average speed is roughly 606 Km.
The best day to arrive at Delhi is Wednesday and it would be best to avoid Saturday, as prices are on average 43.71% higher than on Wednesday. (Average prices, based on 2538133 datapoints.)
We have a lot more statistics for flights 6E 6557 and between Delhi and Kolkata.