There are 3 ferry companies operating from Rafina to Ios, 2 flights from Rafina to Ios. The cheapest ferry costs $85 and is 40min.
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There are 2 ways to travel from Rafina to Ios. 3 ferries and 2 flights are possible between the two areas. The ferry operated by Sea Jets running from Rafina to Koufonissi is the cheapest and fastest. The ferry operated by Blue Star Ferries running from Rafina to Ios 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!