Quickest 6h 3min
There are 1 ferry company operating from Seldovia Harbor to Gustavus Harbor, 4 flights from Seldovia Harbor to Gustavus Harbor. The cheapest ferry costs $380 and is 1d 20h 43min.
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There are 2 ways to travel from Seldovia Harbor to Gustavus Harbor. 4 ferries and 4 flights are possible between the two areas. The flight from ANC to GST is the cheapest and fastest. The ferry operated by Alaska Marine Highway System running from Seldovia Harbor to Gustavus Harbor is the most convenient.
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!