Ferry from Santorini to Kythnos

Right now there is no regular, direct ferry operating from Santorini (Thira) to Kythnos, even though some generic ferry tools and marketing pages still describe this Cyclades connection in broad terms. Up‑to‑date schedule sites either show zero weekly sailings on the Santorini–Kythnos line or state clearly that the route is not currently running, and redirect travellers towards alternative connections via other islands or via Athens ports such as Piraeus or Lavrio. In practice, Kythnos is usually reached from Athens or from nearby Cycladic islands like Serifos, Sifnos or Milos, while Santorini has frequent links to those same hubs, so you can still include both islands in one trip by using an intermediate stop. Because any direct Santorini–Kythnos sailings are at best rare, seasonal or not currently scheduled, it is important to think of this journey as a multi‑leg route and to build your dates around the more frequent ferry lines.

Key Information

Ferry duration

Where this route has operated in recent years, typical journey times between Kythnos and Santorini were around 7 hours to 8 hours, with some sources quoting about 7 hours 35 minutes as an average sailing duration. Since there are no current direct sailings listed from Santorini to Kythnos, you should instead plan on 2 separate legs, such as Santorini to Sifnos or Milos and then on to Kythnos, with total travel times often in the 7 to 10 hour range including connections.

Ferry companies

Past and indirect references to Santorini–Kythnos services mention Seajets and Zante Ferries as operators that link Kythnos with Santorini as part of wider Cyclades routes. Current detailed schedule tools, however, either show no active company on the direct Santorini–Kythnos line or simply present Kythnos connections via other islands and via the Athens ports of Piraeus and Lavrio.

Fast vs slow ferry

When the Kythnos–Santorini link appears in historic or reverse‑direction data, it is normally on conventional ferries with journey times of around 7 hours or more rather than on very fast catamarans. For a realistic modern itinerary, you are more likely to combine a faster ferry such as Seajets on the Santorini–Sifnos or Santorini–Milos leg with a slower, conventional ferry on the Sifnos–Kythnos or Milos–Kythnos segment, mixing speeds across different routes.

Best time to travel

The only realistic time of year to attempt a Santorini to Kythnos journey, even indirectly, is between about May and October, when there are frequent ferries across the central and western Cyclades. In that period you can typically find daily sailings from Santorini to islands like Paros, Naxos, Milos or Sifnos, and regular connections from those islands to Kythnos, whereas in winter many of these links run less often or not at all.

Sea conditions/wind

The sea routes you would use between Santorini, the western Cyclades and Kythnos all lie in areas affected by the summer meltemi wind, which can lead to choppy conditions. Longer legs on conventional ferries are generally manageable, but if you join a high‑speed catamaran for part of the journey, seas can feel more lively, so travellers prone to seasickness usually book larger ships where possible, sit centrally and carry motion sickness remedies.

Port guide

In Santorini, you will always depart from Athinios Port, the main ferry harbour at the base of the cliffs, for whichever intermediate island you choose on the way towards Kythnos. In Kythnos, ferries arrive at Merichas Port on the west coast, which has tavernas, basic services and bus or taxi links to Chora and other villages, and is also the point you use for onward connections to Piraeus, Lavrio and neighbouring Cycladic islands.

Car rental advice

Because there is no simple direct link and you may need 2 or more ferry legs, taking a rental car all the way from Santorini to Kythnos can become expensive and complicated. A more practical approach is usually to return any hire car in Santorini, complete the sea journey as a foot passenger via a hub like Milos or Sifnos, and then rent a car again in Kythnos, where local rental agencies serve the small island road network.

Foot passenger tips

As a foot passenger planning this journey, treat it as a multi‑stop island hop: book a morning ferry out of Santorini to a hub such as Sifnos or Milos, and then an afternoon or next‑day ferry onwards to Kythnos. Allow generous connection times, as summer ferries can be busy and occasionally delayed by wind, and check that your chosen intermediate island has luggage storage or comfortable cafés near the port if you have a long wait.

“Is this route worth it?”

Even without a current direct ferry, combining Santorini and Kythnos in one trip can be very rewarding if you enjoy quieter islands after visiting a busy destination. Many route guides highlight that Kythnos offers hot springs, calm beaches and small villages, so pairing it with Santorini gives you two very different experiences in the same holiday, as long as you are happy to spend a day travelling through one or two other islands.

Alternative route if canceled

Because there is no scheduled direct Santorini–Kythnos ferry to cancel, your “alternative” from the start is to route via another island or via the Athens area. The most practical options are usually Santorini–> Sifnos–> Kythnos, Santorini–> Milos–> Kythnos, or Santorini–> Piraeus/Lavrio by ferry followed by Piraeus/Lavrio–> Kythnos, so it is worth comparing which combination works best for your dates.

Reverse route internal links

The reverse direction, from Kythnos to Santorini, appears more often in data, with some sources describing around 1 sailing per day in certain past seasons and average durations of about 7 hours 35 minutes. However, current 2026 schedule snapshots still show no active direct Kythnos–Santorini sailings, so you should treat both directions the same way and plan a multi‑leg route rather than counting on a simple return ferry.

FAQs about the Santorini to Kythnos route