Flight International Airport departs from Muscat International Airport at 01:30 and arrives at Riyadh King Khaled International Airport at 03:05.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 1291 Km. So the average speed is roughly 500 Km.
There is an 1 hour time difference between Muscat and Riyadh
