Distance from airport in Reykjavik to cruiseport

Does anyone know how far it is from the airport in Reykjavik to the cruiseport and what the best way to get there is? There is a shuttle service from the airport to downtown Reykjavik but I’m not sure how to get to the cruiseport from there. Thanks!

The international airport is in Keflavik, about 30 miles from Reykjavik. From the downtown Reykjavik bus terminal, it's simple to pick up a cab to the cruise port. Without luggage and in good weather it would be an easy walk.