By Sea
Ios can be reached best from Santorini , Naxos , Heraklion - Crete island or directly from Piraeus.
Ferry boats and high speed catamaran services run daily from Piraeus.
All domestic ferry schedules is here (http://www.openseas.gr)
If you plan on travelling to several different islands, it is wise to book all your ferries at once for a possible discount. however, always keep in mind that pickup and arrival times are subject to change at anytime.
