The Arlanda Express is a high speed train that travels between Arlanda airport and the Central train station in downtown Stockholm. The trip takes just 20 minutes (as opposed to 35-40 minutes by car). The trains leave, apporximately, every 15 minutes from around 4:30am to 12:30am. Click here for summer timetable. During the summer (until August 31st) and on weekends during the rest of the year, they have a special where two people travel for 280 SEK. Basically a 2-for-1 special. Keep in mind that it is only economical if you are maximum two persons. Taxis have fixed rates between the airport and Stockholm. For example, Taxi Stockholm costs 520 SEK for a car that seats up to 4 persons. When taking the Arlanda Express, remember to buy your ticket before getting on board at the ticket booth, by using one of the ticket machines on the platform or online at their website. Buying a ticket on board the train costs 50 SEK extra! You will need a credit/debit card with a pin number in order to use the ticket machines. The Central train station is directly above the T-Centralen subway station which connects you to the rest of the city. The Rival Hotel is just three stations away on the red line at the Mariatorget station.