Are there fast ferries from Santorini to Athens and back?
The boat trip takes approximately 7-9 hours depending on the ferry type and the ports of call. A daily high speed boat is available only during the summer period leaving from the port of Piraeus and from numerous other cycladic islands and Crete. From Athens to Santorini costs around 70 euro, but will depend on the season, the ferry line (type of craft) and what for what class you buy your ticket. . Here is a good website with Schedules and rates~ http://www.greek-islands-ferries.
