Flight Heathrow Airport departs from London Heathrow Airport at 22:30 and arrives at Jeddah King Abdulaziz International Airport at 06:45.
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
