Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 16:50 and arrives at Oslo Oslo Airport at 20:35.
The flighttime is about 2h 45m. The distance travelled ("as the bird flies"): 3770 Km. So the average speed is roughly 1371 Km.
There is an 1 hour time difference between Reykjavik and Oslo