With a single ticket you can hop on trams, buses, the metro and even the ferry to Suomenlinna. Day tickets available for 1 to 7 days allow unlimited travel on public transport. Buy your ticket in advance using the HSL app, from ticket machines or from sales points, including kiosks and several shops https://www.hsl.fi/en/tickets-and-fares/sales-points. You can buy single tickets and one-day tickets from the bus driver when boarding a bus. Tickets are not sold on commuter trains, trams or on the metro.
HSL area is divided into four zones, designated by the letters A to D. Buy a ticket for all the zones you travel through. In zones A, B and C, you always have to buy a ticket for at least two zones (an AB or BC ticket). An ABC ticket allows you unlimited travel in Helsinki, Espoo, Kauniainen and Vantaa.
When you search for routes and timetables with the Journey Planner, it tells you which ticket you need for your journey. https://reittiopas.hsl.fi/?locale=en
Some Helsinki Region Transport (HSL) buses and trams offer free wireless internet access. Look for the WLAN sticker on the front window or door of buses and trams.
Helsinki Card holders can travel free of charge on public transport within zones A and B www.helsinkiexpert.com/helsinki_card
HSL’s Service Point: Central Railway Station Metro Station, Mon–Thu 7.30am–7 pm, Fri 7.30am–5pm, Sat 10am–3 pm.
Helsinki Region Transport www.hsl.fi/EN