The ferry operator Hellenic Seaways, has published HighSpeed 4 schedules for the route connecting Piraeus to Paros, Naxos, Ios and Santorini for the Greek Easter Period.
PIRAEUS-PAROS-NAXOS-IOS-SANTORINI (HIGHSPEED 4)
(27/04/13 – 07/05/13)
Monday, Tuesday, Thursday, Friday, Saturday: Piraeus (07:30) – Paros – Naxos – Ios – Santorini
Monday, Tuesday, Thursday, Friday, Sunday: Santorini (17:00) – Ios – Naxos – Paros – Piraeus
All above schedules can be booked online via danae.travel