Flight Barcelona–El Prat Airport departs from Barcelona Barcelona–El Prat Airport at 11:45 and arrives at Reykjavik Keflavík International Airport at 15:30.
The flighttime is about 4h 45m. The distance travelled ("as the bird flies"): 3686 Km. So the average speed is roughly 776 Km.
There is an 1 hour time difference between Barcelona and Reykjavik
