Flight King Khaled International Airport departs from Riyadh King Khaled International Airport at 20:05 and arrives at Guangzhou Guangzhou Baiyun International Airport at 09:45.
The flighttime is about 8h 40m. The distance travelled ("as the bird flies"): 7405 Km. So the average speed is roughly 854 Km.
There is an 5 hour time difference between Riyadh and Guangzhou