Serifos can only be reached by sea, with ferries and hydrofoils from Piraeus (2 hours 40 minutes – 4 hours). The island is also connected to other Cyclades: Kythnos (1.5 hours), Sifnos (50 minutes), Milos (1.5 hours), Paros (2 hours 40 minutes), and Syros (2 hours).
The main ferry companies are Zante Ferries, Hellenic Seaways, Aegean Speed Lines, and Sea Jets. For booking, refer to directferries.com.
Serifos does not have an airport. The closest is Athens International Airport; from there, Piraeus port is easily reached by metro or taxi. For flight booking, visit skyscanner.com.
Connections are much more frequent during the summer season; always check availability if travelling in other periods.