The domestic ferry lines between the Greek islands are operated by the Attica Group of Blue Star Ferries and Hellenic Seaways with plenty of daily departures starting from Piraeus Port,Athens. Detailed timetables and travel times are available on their websites: bluestarferries.com and hellenicseaways.gr.
The following islands can be reached with the Greek Islands Pass *:
Cyclades: Amorgos, Anafi, Andros, Donoussa, Folegandros, Ios, Iraklia, Kea, Kimolos, Koufonissi, Kythnos, Milos, Mykonos, Naxos, Paros, Santorini, Schinoussa, Serifos, Sikinos, Syros, Tinos
Dodecanese: Astypalea, Karpathos, Kastellorizo, Kalymnos, Kasos, Kos, Leros, Lipsi, Nisyros, Patmos, Rhodes, Symi, Tilos
Sporades: Alonissos, Skiathos, Skopelos
Saronic Islands: Aegina, Agistri, Hermioni, Hydra, Poros, Porto Heli, Spetses
North & North-East Aegean Islands: Ag. Efstratios, Chios, Fourni, Ikaria, Lemnos, Mytilene, Oinousses, Psara, Samos
Crete: Chania, Heraklion
* Please note that not all crossings are daily.