Ferry to Lonna Island from Helsinki

The ferry ride from Helsinki’s market square to Lonna takes about 20-25 minutes and drops you on a small, low-key island just outside the main Suomenlinna fortress area. Expect a quiet mix of rocky shoreline, a few renovated brick buildings turned into a simple café and sauna, and pleasant walking paths. It’s not a major attraction packed with sights; instead it feels like a peaceful breather with sea views in every direction. The hop-on hop-off boats that also serve Suomenlinna make it easy to combine both islands in one day or to treat Lonna as a quick standalone visit.

Best time is June to early September when the boats run frequently and you can sit outside comfortably. Expect to pay around €10–18 for a return ticket depending on whether you buy a day pass or single fares; adding a simple lunch or sauna bumps the total to €25–45 per person. Go in the late afternoon when the day-trippers thin out. Pick a table at the café with a view over the water and order the smoked fish; skip the guided tours unless you really want regimented history, as the island is small enough and more enjoyable at your own pace.