What are the transportation options available from Reykjavik Airport to the city center?

The transportation options available from Reykjavik Airport to the city center include buses, taxis, and rental cars. Buses are the most common and affordable option, with several different bus companies offering services to various locations in the city center. Taxis are also available outside the airport for a more convenient but pricier option. Rental cars can be picked up at the airport for those who prefer to drive themselves.