Flight King Khaled International Airport departs from Riyadh King Khaled International Airport at 09:40 and arrives at Dubai International Airport at 12:35.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 964 Km. So the average speed is roughly 503 Km.
There is an 1 hour time difference between Riyadh and Dubai
The best day to arrive at Riyadh is Tuesday and it would be best to avoid Saturday, as prices are on average 115.7% higher than on Tuesday. (Average prices, based on 315369 datapoints.)
We have a lot more statistics for flights EK 820 and between Riyadh and Dubai.