Helsinki Airport's train station is located under the terminal. There is a direct elevator and escalator connection from the departures and arrivals hall to the train station.
Local I and P trains operate to and from Helsinki Airport. A train ride to Helsinki City Centre takes about 30 minutes. Local train tickets can be purchased from HSL's mobile app, or from the ticket machine at the train platform. Timetables, tickes and fares for local trains and can be found on HSL.fi.
You can travel easily from Helsinki Airport to all around Finland with only one train ticket. It’s convenient to change to from the local I and P trains to long distance trains at Tikkurila and Pasila train stations.
Check the airport train schedule here.