Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 19:30 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 21:40.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 1262 Km. So the average speed is roughly 582 Km.
The best month to arrive at Delhi is November and the most expensive month to fly is June. (Average prices, based on 260 datapoints.)
We have a lot more statistics for flights 6E 2526 and between Delhi and Kolkata.