Amorgos is the long, steep island at the eastern edge of the Cyclades, famous for the Hozoviotissa monastery clinging to its cliffs and for some of the best hiking in the islands. Santorini lies about 43 nautical miles to the south-west. Travellers use this crossing to swap Amorgos's quiet trails for the caldera, or to reach Santorini's airport and bigger ferry connections at the end of a trip.
The route is a study in contrasts on price. Seajets runs the fast boat and carries most passengers, at €77.70 per adult in last year's data. Small Cyclades Lines, the local operator that keeps the smaller islands connected, charges from €11.50 but takes about three times as long and sails once a week. Blue Star Ferries appears only occasionally. If your dates are flexible, the cheap sailing is worth looking for.
Amorgos has two ports, Katapola in the south and Aegiali in the north, and the Santorini boats normally leave from Katapola. If you are staying in Aegiali, allow for the drive across the island on the morning you leave. At the other end you arrive at Athinios, Santorini's main ferry port, which can be chaotic in high season.
There is no winter service: Ferryhopper lists this route from February to October only. In summer the fast boat runs most days, but on our 12 August 2026 sample there was just one departure, in the early evening, so plan your connection before booking a room on Santorini.