Flight King Abdulaziz International Airport departs from Jeddah King Abdulaziz International Airport at 16:55 and arrives at Riyadh King Khaled International Airport at 18:30.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 880 Km. So the average speed is roughly 556 Km.
The best day to arrive at Jeddah is Sunday and it would be best to avoid Thursday, as prices are on average 143.3% higher than on Sunday. (Average prices, based on 2000640 datapoints.)
We have a lot more statistics for flights XY 40 and between Jeddah and Riyadh.