Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 17:40 and arrives at Helsinki Helsinki Vantaa Airport at 00:05.
The flighttime is about 3h 25m. The distance travelled ("as the bird flies"): 5304 Km. So the average speed is roughly 1552 Km.
There is an 3 hour time difference between Reykjavik and Helsinki