Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 03:40 and arrives at Rome Leonardo da Vinci–Fiumicino Airport at 08:15.
The flighttime is about 9h 05m. The distance travelled ("as the bird flies"): 7253 Km. So the average speed is roughly 798 Km.
There is an 4.5 hour time difference between Delhi and Rome