3 operators run this water, from 1 h 35 to 3 h 10 — a difference of 1 h 35 on the same crossing. Piraeus-Athens has an airport 20 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 Piraeus-Athens without a change. It is the question a single-route page cannot answer about itself and an atlas can.
Anafi · Andros · Folegandros · Ios · Kea · Kimolos · Lavrio · Milos · Mykonos · Naxos · Paros · Santorini (Thira) · Serifos · Sifnos
Aegiali · Aegina · Agios Kirikos · Agistri · Alicante (Bus Station) · Amorgos · Anafi · Andros · Antikythira · Aqaba · Astypalea · Barcelona · Bari (FS Park Via Capruzzi) · Benoa
Our records for the Kythnos–Piraeus-Athens 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 1 h 35 and Aegean Sea Lines at 3 h 10 is mostly a price decision, and we hold no prices for either.
No departure times. No rate is held for this pair either, so we cannot say how often it runs.