Flight King Khaled International Airport departs from Riyadh King Khaled International Airport at 09:30 and arrives at Rome Leonardo da Vinci–Fiumicino Airport at 13:40.
The flighttime is about 6h 10m. The distance travelled ("as the bird flies"): 4143 Km. So the average speed is roughly 672 Km.
There is an 2 hour time difference between Riyadh and Rome