Arlanda South Station (Swedish: Arlanda södra station) is a railway station on the Arlanda Line serving Stockholm-Arlanda Airport in Sweden. The station is one of two stations at the airport to be served by the Arlanda Express, the other being Arlanda North Station. The station is located inside a tunnel below the airport and is served by four or five trains per hour. The station serves Terminal 2, 3 and 4 of the airport.