Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 04:45 and arrives at Guwahati Lokpriya Gopinath Bordoloi International Airport at 07:10.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 1609 Km. So the average speed is roughly 666 Km.
The best day to arrive at Delhi is Sunday and it would be best to avoid Monday, as prices are on average 148.85% higher than on Sunday. (Average prices, based on 707039 datapoints.)
We have a lot more statistics for flights 6E 251 and between Delhi and Guwahati.