Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 10:00 and arrives at Helsinki Helsinki Vantaa Airport at 15:30.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 5304 Km. So the average speed is roughly 1515 Km.
There is an 2 hour time difference between Reykjavik and Helsinki