Helsinki’s current population is about 604,380, but the Greater Helsinki region including the suburbs of the neighboring administrative areas of Espoo and Vantaa has a population of over 1.3 million.
More information on Wikitravel
T1: SAS, Blue1 and other Star Alliance airlines (except Turkish Airlines in T2).
T2: Finnair, OneWorld partners, KLM, Norwegian and most other airlines.
Regional buses 615/620 (€5.00, every 15 min), 30-40 min to the Helsinki Central Railway Station in the heart of Helsinki. The price includes onward transfers by tram, bus, metro, local train, etc. Both buses leave from platform 2 at terminal T1 and platform 21 at terminal T2. Tickets can be bought from the driver. To get to Helsinki city center from the airport you need to buy a regional ticket, because the airport is actually not located in Helsinki, but the neighboring city of Vantaa.
Finnair City Bus (€6.30, every 20 min), about 35 min to Central Railway Station via Scandic Continental Hotel. Credit cards accepted, slightly faster and uses luxury coaches, but no further connections included in the ticket price.
Regional buses 519/520 to Itäkeskus (€5, every 30 min), for convenient connections to the metro and eastern suburbs of Helsinki.
Vantaa bus 61 to Tikkurila (€3), connections to the center and eastern parts of Vantaa and access to the closest railway station for intercity and regional train connections. All north and east-bound trains stop here (Tikkurila Station).
Vantaa bus 51 to Hämeenkylä (€3, every 30 min), connections to western Vantaa: suburbs of Myyrmäki, Martinlaakso and Hämeenkylä.
Regional U-line bus 540 to Espoo (€5), for connections to the suburbs of Leppävaara, Nihtisilta, and Espoonkeskus in Espoo.
Regional buses 514/535 to Espoo (€5), for connections to the suburbs of Leppävaara, Westend, Tapiola and Espoonkeskus in Espoo.