Koufonisi is the smallest inhabited island of the Lesser Cyclades, a low, sandy outcrop with a single harbour village and some of the clearest water in the Aegean. Piraeus, at the other end of the crossing, is Greece's main passenger port -- a sprawling complex of numbered gates just a short metro ride from central Athens. Between the two lies open sea and, depending on the operator, a handful of island calls, so this is one of the longer hauls on the Cyclades network rather than a quick hop.
Two very different kinds of ferry cover the route, and that shapes how you should think about frequency. Fast catamarans keep the crossing to a morning or afternoon's sailing, while the conventional ferry option takes the best part of a day and often runs overnight, calling at other islands on the way. Departures are most plentiful in the height of summer and thin out as the season winds down -- check the schedule box above for what is currently confirmed rather than relying on any fixed count.
Useful Resources for Your Greek Island Trip
- Find accommodation in Greece – hotels, apartments and villas on Booking.com
- Book tours and activities in Greece via Viator
- Find guided experiences and day trips via GetYourGuide
- Compare car hire prices in Greece via DiscoverCars
Exploring Athens?
If you have time before or after your ferry, there is plenty to see near the capital. Browse our complete guide to the best day trips from Athens – from ancient ruins and mountain villages to coastal escapes and island hops.