The complete guide to Helsinki by boat

Going out on the water in Helsinki means one of three things: the HSL ferry to Suomenlinna, which is public transport and crosses in 15 minutes on an ordinary city ticket; a sightseeing loop of about 1 hr 30 from the quay at Market Square, out through an archipelago of roughly 330 islands and back without landing; or a ship to Tallinn or Stockholm from a harbour on the other side of the centre. I sold tickets for nine summers at a kiosk on that quay, and almost every problem I saw came from confusing two of those three.

The Suomenlinna ferry is a tram that floats

It is run by HSL as part of the city transport network. It leaves from the eastern side of Market Square, in front of the Presidential Palace, takes 15 minutes, and runs every day of the year from early morning until late at night — several times an hour in summer, at least hourly in winter. An ordinary AB ticket, valid 90 minutes, pays for it: the same ticket that works on the tram. There is no commentary and no sundeck bar. What there is instead is the fortress at the end of it — eight islands, six of them fortified, begun in 1748 as Sveaborg, renamed Suomenlinna on 12 May 1918, and a UNESCO World Heritage Site since 1991. People pay for a “Helsinki boat tour” expecting that and get a loop that never lands. Others queue at the ferry gate expecting a bar.

A sightseeing boat mostly does not land anywhere

This is the part that disappoints people, so I will be blunt. The archipelago loops go out through the channels between the islands, show you the city front and the fortress walls from the water, and bring you back to the same quay. That is the product. It is not island hopping, not a ferry, and not a way of reaching a museum. Of the six things bookable here, only the RIB tour lands, on an island for a snack lunch and a public sauna, and the Tallinn ferry, in another country.

Having said the unflattering half: the loop is good at what it is. Ninety minutes, sitting down, with an audio guide in 28 languages over the loudspeaker and as a downloadable app, an outdoor sundeck, and food and drink on board. For a free morning, a cruise call with a fixed all-aboard time, or anyone who would rather sit than walk, it is the most city you will see for the least effort. The evening version runs 2 hrs 30 from the pier marked with tall red flags, and adds Wi-Fi, toilets and a bar.

The season is the constraint, not the forecast

The sightseeing fleet runs roughly May to September, the bus-and-boat combination from 2 May to 30 September, and JT-Line’s island boats to fixed dates — Vallisaari from 20 May to 12 September 2026, Pihlajasaari from 16 May to 30 August 2026. Outside those windows the options shrink to the Suomenlinna ferry and the international ships. I have stood on that quay on a November afternoon when the ferry was the only boat still running.

Within the season, June, July and August are the months for being on deck, with May and September as a quieter, milder shoulder carrying a real chance of cold nights and rain. July averages about 18 °C; August is the wettest month of the year.

Light is the thing nobody checks

Midsummer, on 21 June, gives 18 hours 50 minutes of daylight, and the white nights, when it never gets properly dark, run roughly from 12 May to 2 August. So an evening cruise booked for late June sails in full daylight, and the sunset people imagined is around midnight or not at all. In late August and September the same sailing gives you the low light on the cathedral fronts. Midwinter gives 6 hours of daylight. The daytime loop and the evening loop show you two different cities, and the month decides which one you get.

The coat, and the wind

I am opinionated about coats and I have earned it. The wind comes across the open water at Market Square even in June, and the sundeck empties the moment the boat leaves the shelter of the islands. Bring one more layer than the air temperature suggests, and something that stops wind rather than something warm. The water inside the channels is flat, so seasickness is rarely the problem. Being cold on an open deck is.

Tallinn and Stockholm leave from somewhere else

This is the other thing people get wrong, and it costs them a morning. The international ships do not leave from Market Square. Tallink Silja and Eckerö Line sail to Tallinn from West Harbour (Länsisatama) Terminal 2 in Jätkäsaari; Viking Line sails to Tallinn and to Stockholm from Katajanokka. Tallinn is about 80 km across the Gulf of Finland, the crossing takes about 2 hours at the fast end, and there are around ten crossings a day. A return day trip allows up to about 9.5 hours in the city, for a door-to-door day of 11 to 14 hours — far too long for a cruise-ship call. Stockholm is an overnight sailing of 17 to 18 hours. Carry your passport or ID card: there is no hard border inside Schengen, but the carriers check identity.

What I would tell someone coming once

Take the loop in the morning for the city from the sea, then take the public ferry to Suomenlinna in the afternoon on a city ticket and give the fortress two or three hours. That is a full day and it needs no taxi. Avoid the queue for the last ferry back on a July Sunday, and do not feed the gulls at Market Square, because they will take the rest off the table. If what you wanted was to stand on an island, book the RIB or buy a city ticket — the loop will not do it for you. The emergency number in Finland is 112.

Ready to pick a boat?

If you have ninety minutes and want the city from the water, the archipelago loop is the obvious one; if you want to stand on an island, take the public ferry instead and keep your money. The full comparison, including the evening sailing and the RIB, is on which boat to choose, and everything bookable is listed on the all-boats page.

One reminder, because it is the mistake I watched most often from the kiosk: the widget above books a sightseeing boat, not the ferry to Suomenlinna. The ferry is run by HSL as part of the city’s public transport, you buy it the way you buy a tram ride, and nobody sells a separate ticket for it here. The ferry has its own page.

Frequently asked questions