Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 18:35 and arrives at Surat Surat International Airport at 20:30.
The flighttime is about 7h 25m. The distance travelled ("as the bird flies"): 531 Km. So the average speed is roughly 72 Km.
There is an 5.5 hour time difference between Delhi and Surat