Syros and Serifos belong to different strands of the Cyclades. Syros is the central hub, with its elegant port town of Ermoupoli and boats to Tinos, Mykonos, Paros and Naxos; Serifos is one of the western islands, strung out with Kythnos, Sifnos and Milos along a line that runs south from Attica. Serifos is rugged and quiet, with a whitewashed Chora spilling down a steep hill above the harbour, and it is exactly the kind of island people want to add after a few busy days elsewhere.
The trouble is that ferry lines in the Cyclades mostly run outwards from Athens, and there is little traffic across the middle between the central and western groups. When we checked on 24 September 2026, Ferryhopper had no route page for Syros to Serifos in either direction, and we have no sampled timetable for a direct sailing. Older listings on our own site could not be matched to any dated timetable, so we do not repeat their times and prices.
The reliable answer is to go through Piraeus, the main port of Athens. Both legs are well served: Syros has sailings to Piraeus every day of the year, and Serifos has boats from Piraeus on 4 to 7 days a week in every month. On high-speed boats, the two legs together take about four hours of sailing, so with a sensible connection you can leave Syros in the morning and reach Serifos the same day.
Still, search your date for a direct boat first: ships sometimes add calls on longer itineraries. And book the Piraeus to Serifos leg early in July and August, when the western islands fill with Greek holidaymakers.
