The horseshoe harbour of Spetses from the sea
After a photo by Gilles G. (CC BY-SA 4.0). Credits

The two ports

Piraeus

Run by the Piraeus Port Authority (OLP). The Spetses passenger boats leave from Gate E8, with Hellenic Seaways' Aero catamarans boarding from Gate E9 — both about a 10-minute walk from the Piraeus metro station (Line 1 terminus). The port map pins E8 for the Saronic & Spetses fast boats.

Port Authority / Port Police
+30 210 4593104
Coast guard
+30 210 4593104
Address
Piraeus, 18531 Athens, Greece

Inside the port, the Gate E8 ticket booths include the Saronic-Spetses sales point (+30 210 4190200 / +30 210 4121830). For delays on the Piraeus side, call Hellenic Seaways' Piraeus number (+30 210 419 9000).

Spetses

Boats arrive at Spetses town in the horseshoe-shaped dock. The port is run by the Port Authority and the Municipal Port Fund, and Spetses Municipal Port Fund acts as the island agent for Hellenic Seaways.

Spetses Port Authority (Coast Guard)
Harbour master's office · +30 23050 22017 · VHF 12
Spetses Municipal Port Fund
+30 23050 22027
Spetses Municipal Port Fund (agent)
· +30 23050 53812

Bad weather cancels fast boats first; check with the company or the Port Authority before you set off.

Sources: Hellenic Seaways - Piraeus port map & entrance gates (E8 / E9 for Saronic fast boats) · Municipal Port Fund of Spetses - phones, mooring, water · Municipality of Spetses - official site, useful phones · Municipality of Spetses - official site, useful phones · Hellenic Coast Guard - list of port authorities (e-ΔΛΑ)