Helsinki and Tallinn are only 80km apart. Viking line , Eckerö line and Tallink Silja operate full-service car ferries all year round. Depending on the ferry type travel times are from slightly over two hours (Viking Line and Tallink Silja's Star, Superstar and Superfasts) to three and a half hours (Eckerö and Tallink Silja's biggest cruise ships). Some services travel overnight and park outside the harbor until morning. Linda Line offers fast services that complete the trip in hours, but charge quite a bit more, have comparatively little to entertain you on board and suspend services in bad weather and during the winter. If the weather is looking dodgy and you're prone to sea sickness, it's best to opt for the big slow boats.