Flight King Khaled International Airport departs from Riyadh King Khaled International Airport at 22:35 and arrives at Colombo Bandaranaike International Airport at 06:10.
The flighttime is about 5h 05m. The distance travelled ("as the bird flies"): 3756 Km. So the average speed is roughly 739 Km.
There is an 2.5 hour time difference between Riyadh and Colombo