Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 07:20 and arrives at Frankfurt Frankfurt Airport at 13:00.
The flighttime is about 4h 40m. The distance travelled ("as the bird flies"): 3782 Km. So the average speed is roughly 810 Km.
There is an 1 hour time difference between Reykjavik and Frankfurt
