m/s kerttu

Cruises on M/S Kerttu

Enjoy the sun and the waves

Cruises on M/S Kerttu are organised in Uusikaupunki during open water season. On board Kerttu, you can cruise to the lighthouse island, do a sightseeing tour of the archipelago, or spend and evening enjoying the nice atmosphere. Kerttu is also available for chartered cruises.

From June to August Kerttu sails to the Isokari lighthouse island on a regular schedule. The Isokari cruise includes, in addition to the return trip, lunch and a guided tour of Isokari as well as access to the lighthouse.

On Fridays during high summer, Kerttu does sightseeing tours of the inner archipelago: on the 2-hour evening cruise you can enjoy the relaxing sea, fun programme and Kerttu's summery treats. The ship is fully licensed to serve alcohol.

Tickets for a trip to Isokari can be booked online. Tickets can also be purchased directly from the ship on the day of the trip if there is room left.

Kerttu’s departure pier is at the city guest harbour, right behind Pakkahuone. Welcome!

Cruises to the Isokari lighthouse island

June 10–19 Thu, Fri, Sat

June 30 to August 28 Wed – Sun
(wed, Thu, Fri, Sat and Sun)

August 28 Finnish Nature day

Departure at 10.30 am, return at 5.30 pm


adults 69 €

children 4–12 yo 35 €

children 0–3 yo free admission
incl. return sea transportation, lunch at Isokari, guided tour of Isokari, and admission into the lighthouse.

Friday´s Sight-seeing cruises

Enjoy Uusikaupunki summer on the waves!

Fridays between July 16 and August 7

from 6 pm to 8 pm


adults 20 €

children 4–12 yo 10 €

Other cruises on M/S Kerttu:

Seal safaris
May 2, May 3, May 9, May 16, May 17, June 6, and June 13.
June 6, June 7, June 13 and June 14
Includes visit to Isokari island

Seal safaris

May 8, 12, 16 and June 6, 10, 13, 16 at 9 am – 6 pm
Tickets: adults 119 €, children under 12 yo 59 €
incl. travel Uusikaupunki–Sandbäck–Isokari–Uusikaupunki, coffee on board, lunch and admission into the lighthouse Bird-watching trips

Spring cruises

May 13, 14 and 15
Tickets: adults 69 €
children 4–12 yo 35 €
children 0–3 yo free admission

International Lighthouse Day cruise August 14                      



Tickets and bookings

info [at] isokari.fi


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Tickets and bookings

Tel. +358 (0)40 1866 350