There are 2 ferry companies operating from Piraeus to Karpathos, 4 flights from Piraeus to Karpathos. The cheapest ferry costs $308 and is 1h 35min.
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There are 2 ways to travel from Piraeus to Karpathos. 4 ferries and 4 flights are possible between the two areas. The flight from JSY to AOK is the cheapest. The ferry operated by Blue Star Ferries running from Piraeus to Astypalea is the fastest. The ferry operated by Blue Star Ferries running from Piraeus to Astypalea 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!