Flight Heathrow Airport departs from London Heathrow Airport at 15:35 and arrives at Jeddah King Abdulaziz International Airport at 23:50.
The flighttime is about 6h 15m. The distance travelled ("as the bird flies"): 5348 Km. So the average speed is roughly 856 Km.
There is an 2 hour time difference between London and Jeddah