Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 10:35 and arrives at London London Gatwick Airport at 14:40.
The flighttime is about 3h 05m. The distance travelled ("as the bird flies"): 2853 Km. So the average speed is roughly 925 Km.
There is an 1 hour time difference between Reykjavik and London