We recommend using DoHop when searching for car rentals in Iceland. The rental car companies are very similar but this search engine will help you find the best deals.
Airport transfer
If you are not planning on renting a car, the most common and best way for small groups is the FlyBus or Airport Direct from Keflavik International Airport. The regular FlyBus takes you to the central bus station at BSÍ and from there you can take the public bus or a taxi. Airport Direct stops in Hamraborg, Kópavogur.
The public bus nr. 55 travels regularly throughout the day from the airport to the capital area. Please note that the bus does not always drive all the way to BSI bus station, downtown Reykjavik. In those cases the last stop is at Fjörður, in Hafnarfjörður, which is a town just outside Reykjavik.