Flight King Abdulaziz International Airport departs from Jeddah King Abdulaziz International Airport at 16:30 and arrives at Riyadh King Khaled International Airport at 18:20.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 880 Km. So the average speed is roughly 480 Km.
The best month to arrive at Jeddah is March and the most expensive month to fly is August. (Average prices, based on 3600 datapoints.)
We have a lot more statistics for flights SV 1078 and between Jeddah and Riyadh.