Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 09:15 and arrives at London London Gatwick Airport at 13:10.
The flighttime is about 2h 55m. The distance travelled ("as the bird flies"): 2853 Km. So the average speed is roughly 978 Km.
There is an 1 hour time difference between Reykjavik and London