Jussi Hellsten / VisitHelsinki
Although Finland is a large and not populated country you can getting around without problems.
The public transport network system are very reliable and good including by air, rail, road and water .
Local trains I and P operate between Helsinki Airport and the city centre on the Ring Rail Line every 10–20 minutes. The journey takes 30 minutes. A regional ticket is required and it can be purchased from a ticket machine (ABC ticket €4,60) or via the HSL mobile app: https://www.hsl.fi/en/mobileticket.