Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 16:30 and arrives at Chicago O'Hare International Airport at 17:20.
The flighttime is about 5h 50m. The distance travelled ("as the bird flies"): 7278 Km. So the average speed is roughly 1248 Km.
There is an 5 hour time difference between Reykjavik and Chicago