Hej! The easiest way is to take the airport coach, a one-way ticket cost 79/89 SEK depending on if you buy it via internet or not. If you decide to not buy it in advance, make sure you can pay with your banc card or your phone because I don't think they accept cash payments anymore.Check this website for more information: http://www.flygbussarna.se/PageFB.aspx?page=5262&lang=EN Hoppas du får en bra resa!