Finnair City Bus and Airport Bus 615 (620 during night time) operate to and from Helsinki City Center (railway station). From Tikkurila Railway station operates Airport Bus 61.
Timetables and routes for Airport Buses and buses for various parts of the Helsinki Metropolitan Area can be easily found on the web site of Helsinki Region Transport (HSL).
Bus connections to and from other parts and cities of Finland are available on the timetable search of Matkahuolto.
Bus transportation to nearby hotels and airport's parking areas is available free of charge.
At the airport, the bus stops for both arriving and departing buses are situated in front of the terminals.
A journey by taxi from the airport to the centre of Helsinki takes about 30 minutes and costs around 45 to 50 euros. The taxi stands are located right outside the arrival areas of the terminals.
There are also three taxi operators at Helsinki Airport that offer special taxi services, fixed fare shared taxi, tours and charter rides.