The Baltic Sea is crossed by several cruiseferry lines. Some important shipping companies are Viking Line, Silja Line, Tallink, St. Peter Line, Eckerö Line and Birka Line.
Silja Line and Viking Line operate competing cruiseferries on the routes - Turku and Stockholm - Helsinki, calling in Åland (Mariehamn or Långnäs). Additionally, Tallink sails - Mariehamn - Tallinn and - Riga. Tallink, Viking Line and Eckerö Line compete on the Helsinki - Tallinn route, which is also the busiest route in the Baltic Sea, travelled by over 6 million people in 2008.
Baltic routes are mostly served by new ships purpose-built for the routes. Older cruiseferries from the Baltic serve as ferries on other seas, or in some cases, as cruise ships.
Viking Line and Eckerölinjen also operate short routes from Sweden to Åland, sailing on Kapellskär - Mariehamn and Grisslehamn - Berghamn. Birka Line, owned by Eckerö, also operates short cruises out of Stockholm.
Generally GTS Finnjet of 1977 is considered to have been the first cruiseferry, she was the first ferry to offer cruise-ship quality services and accommodations, and the first generation of cruiseferries operating from Finland to Sweden were highly influenced by Finnjet's interior and exterior designs. After the fall of the Soviet Union the route connecting Helsinki to Tallinn became highly lucrative, which led to Estonia-based company Tallink to grow and rival the two long-established companies (Viking Line and Silja Line). Eventually Tallink purchased Silja Line in 2006.