2 operators run this water, from 2 h 50 to 5 h 25 — a difference of 2 h 35 on the same crossing. Sifnos has an airport 37 km from the quay, so this is a crossing you can make one way and fly the other.
One row per operator and speed. Where a service is sold as fast and its average does not clear 45 km/h, the word appears in quotation marks — the boat is fast craft, the crossing is not.
If this crossing does not suit, these quays also reach Sifnos without a change. It is the question a single-route page cannot answer about itself and an atlas can.
Anafi · Andros · Athens (Rafina) · Chalki · Diafani · Folegandros · Heraklion · Ios · Karpathos · Kasos · Katapola · Kea · Kimolos · Kos
Amorgos · Andros · Athens (Rafina) · Folegandros · Heraklion · Ios · Katapola · Kea · Kimolos · Koufonisia · Koufonissi · Kythnos · Lavrio · Milos
Our records for the Santorini (Thira)–Sifnos crossing were read on 11 August 2026 and describe the network as it ran that week. We hold no month-by-month variation, so this page cannot tell you whether a crossing runs in February.
If you are travelling well outside August 2026, confirm with the operator before you plan around it.
No fares. The choice between SeaJets at 2 h 50 and Cyclades Fast Ferries at 5 h 25 is mostly a price decision, and we hold no prices for either.
No departure times. A weekly rate is a lower bound on how often the crossing runs — never a clock.