Quickest 4h 15min
There are 2 ferry companies operating from Mariehamn to Turku Harbor from Mariehamn to Turku Harbor. The cheapest ferry costs $114 and is 5h 25min.
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There is just 1 way to travel from Mariehamn to Turku Harbor. 2 ferries are possible between the two areas. The ferry operated by Viking Line running from Mariehamn to Turku Harbor is the cheapestand most convenient. The ferry operated by Viking Line running from Langnas to Turku Harbor is the fastest.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!