Helsinki has the only metro and trams. All Finnish cities and towns have a bus network, with departures every 10 to 15 minutes in large towns, every 30 to 60 minutes in smaller towns. Fares are around €2.50 to €3.50: pay the driver.
The taxi (taksi) in Finland is an expensive creature, particularly for short rides. There’s a flagfall of €5.90 in Helsinki (often more elsewhere) and a per-kilometre charge of €1.55. These increase if there are more than two passengers, and there’s a surcharge for night and weekend service.
Hail taxis at bus and train stations or call. Shared taxis often cover airport routes, and are a common mode of transport in Karelia, Kainuu and, to a lesser extent, Lapland.