For a first Helsinki island trip, Suomenlinna is the simplest year-round choice: the HSL ferry runs from Market Square and accepts the appropriate public-transport ticket. Lonna, Vallisaari and Pihlajasaari offer different summer experiences, but their boats are separate commercial services. Choose the island first, then check its operator, departure pier and return timetable - not merely a general Helsinki ferry search.[1][2]
Start with the season, not the photograph
Helsinki's island network is not a single transport system operating to one timetable. The city's water-transport guide distinguishes HSL services from commercial routes and explains that much of the archipelago's visitor traffic is seasonal. Operators and departure points differ by island.[1]
That matters particularly outside summer. A beach photographed in July does not establish that a scheduled boat will take you there in November. At publication on 30 October 2026, JT-Line states that its regular Vallisaari service has finished for the 2026 summer season.[3] The practical late-autumn recommendation is therefore different from the summer recommendation: start with the year-round Suomenlinna ferry, not an imagined island-hopping circuit.
For a future summer visit, wait for the relevant year's operating calendar before buying a non-refundable activity on an island. Restaurant reservations, sauna slots and ferry departures are separate pieces of the same outing. A confirmed table is not proof that a particular boat is included.
A good plan also names the return sailing before you leave the mainland. You can remain flexible about lunch or walking, but the last connection should not be a surprise discovered at the pier.
Suomenlinna: history with the simplest ticket arrangement
The HSL passenger ferry leaves Market Square for Suomenlinna's main pier throughout the year. The official fortress guide gives a crossing time of about fifteen minutes and describes more frequent summer departures, with at least hourly service in winter. It also distinguishes the regular passenger ferry from the weekday service ferry out of Katajanokka.[2]
For an ordinary first visit, use the passenger ferry from Market Square. It brings you into the main visitor route without needing to understand cargo-oriented arrangements. HSL's visitor guidance specifies an AB ticket for travel from central Helsinki; a valid ticket covering those zones is what matters, rather than a separate fortress admission charge.[4]
The destination suits travellers who want a substantial walk, historic surroundings and the freedom to decide how many paid interiors to visit. Getting there does not compel you to buy a sightseeing package. Equally, the low-friction ferry should not make the island feel like a ten-minute stop: the crossing is only the transport component of the outing.
In summer, a commercial waterbus offers another way to reach Suomenlinna, with different landing points and some services involving Lonna. Its own tickets are required: HSL public-transport tickets are not valid on that waterbus.[2] Choose it for the route or landing point you need, not because two neighbouring piers look interchangeable.
Lonna: choose it around a meal or sauna booking
Lonna is the small-island option for a visit organised around a particular experience. Its operator describes a restaurant, public sauna and bar, with access by FRS Finland waterbus from Market Square. The island's own directions put the crossing at approximately ten minutes.[5]
The useful distinction is scale. Do not book Lonna expecting the same extended fortress walk as Suomenlinna. It makes more sense when you want a meal, a sauna session or a compact maritime escape. Decide which of those you are going for before selecting your departure.
For a sauna booking, allow time to arrive, orient yourself and change without rushing. For dinner, choose a return connection that leaves room for the meal rather than treating the last course as a race against the ferry. Ask whether an advertised package includes transport; do not infer that from a photograph of the boat.
Combining Lonna and Suomenlinna can work when the operator's ticket and timetable explicitly support it. It is not something to improvise from the fact that the islands are close together. Establish permitted stops, boarding arrangements and the final return before paying for a multi-stop plan.
Vallisaari: a walking destination with a seasonal boat
JT-Line operates the Market Square route to Vallisaari. Its official information describes a roughly twenty-minute waterbus journey and, for the present late-autumn period, explicitly says that scheduled service has ended for 2026.[3]
For a summer visitor choosing between islands, Vallisaari is better approached as a landscape-and-walking outing than as a shortcut to another attraction. Give it its own block of time. A ferry ticket is useful only if the time ashore is sufficient for the walk you intend to take.
Do not use an old operator name or a previous season's sailing screenshot to settle the trip. Helsinki's city guide currently identifies JT-Line for Vallisaari, which is the source to follow for the new season's departures and ticket products.[1] A route being advertised on a general tourism page does not establish an October service.
When comparing a guided excursion with independent travel, ask what the guide adds: interpretation, a planned route or coordinated transport. A simple boat ticket and a narrated island visit are different products. Neither is inherently better; the appropriate choice depends on whether you want freedom or structured explanation.
Pihlajasaari: a summer outing from a different part of town
Pihlajasaari is the beach-oriented alternative. The city describes its beaches and island facilities, and identifies JT-Line as the ferry operator. The operator's 2026 information lists departures from Merisatama and Ruoholahti, rather than treating Market Square as the starting point for every island.[6][7]
That departure-point difference can change the best itinerary. A visitor already staying near Ruoholahti should compare that sailing with the Merisatama option rather than travelling across town to a pier that does not serve the intended island. Enter the actual departure location into your route planner.
A beach day also has different packing needs from a fortress walk. Take what you need for the planned activity and a layer for the boat; avoid assuming that every desired item can be bought on arrival. For families, the return time should be a comfortable choice rather than the very last possible boat after an overlong afternoon.
As with Vallisaari, treat published summer dates as a seasonal boundary. The operator's daily 2026 period is not a guarantee of daily service throughout the year, nor a confirmed timetable for summer 2027.[7]
Build the ticket around the outing
The most reliable comparison is straightforward: Suomenlinna for a year-round historic walk, Lonna for a booked meal or sauna, Vallisaari for a seasonal walking trip and Pihlajasaari for a summer beach outing. Those are editorial choices based on the distinct transport and visitor arrangements, not a ranking of one island above all others.
Before purchase, write down the island, operator, outward pier, return pier and last usable departure. Then check whether the price is one-way, return or part of a permitted multi-stop product. Public-transport passes and commercial island tickets are not interchangeable simply because the boats share a waterfront.
One well-planned island usually gives a better day than several hurried transfers. Leave room to walk, sit down and enjoy being offshore; the ferry should make that possible, not become the entire itinerary.
