In Stockholm you change to the ferry to Finland: either to Turku (cheaper) or Helsinki. From there you continue with a ticket of VR. As overnight stay you can use the night train Malmö to Stockholm and/or the ferry Sweden to Finland. There are two main routes. Compare them and decide which one feeds your needs best.
Stockholm To Helsinki Pro Tip: There are several ferry companies doing this route, with around 30 sailings every day. You can choose from fast, 1.5-hour crossings to slower ones, taking 2.5
Departing from the Stadsgården Terminal in Stockholm, this this Viking Line ferry sails to Helsinki. There are several options of cabins, each with a private private bathroom featuring a shower and toilet, as well as a desk or seating area. Guests can sample authentic Nordic cuisine and a selection of wines at the range of bars and cafés onboard.

Stockholm-Helsinki (40h) Stockholm-Tallinn (40h) Turku-Kapellskär (22h) There are no departures for the next two months, please choose a different route.

Overnight ferry crossing for passengers from Stockholm to Helsinki. Accommodation in 2-berth cabin with shower/WC, including Scandinavian breakfast buffet. Train from Bergen to Voss; Bus from Voss to Gudvangen; Boat from Gudvangen to Flåm; Train from Flåm to Vatnahalsen (from Flåm to Myrdal in winter) Train from Vatnahalsen via Myrdal to Oslo . 360 439 54 230 386 26 1 441

is there a ferry from stockholm to helsinki