Flight London Gatwick Airport departs from London London Gatwick Airport at 15:00 and arrives at Jeddah King Abdulaziz International Airport at 23:15.
The flighttime is about 6h 15m. The distance travelled ("as the bird flies"): 5304 Km. So the average speed is roughly 849 Km.
There is an 2 hour time difference between London and Jeddah