Flight Keflavík International Airport departs from Reykjavik Keflavík International Airport at 17:10 and arrives at Boston General Edward Lawrence Logan International Airport at 18:50.
The flighttime is about 6h 40m. The distance travelled ("as the bird flies"): 5559 Km. So the average speed is roughly 834 Km.
There is an 5 hour time difference between Reykjavik and Boston