Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 08:20 and arrives at Rome Leonardo da Vinci–Fiumicino Airport at 14:00.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 4567 Km. So the average speed is roughly 1246 Km.
There is an 2 hour time difference between Reykjavik and Rome