Being the main port of the Dodecanese, Rhodes is linked with all the other islands of the group during summer time.
Schedules can be found at the EOT and the Municipal Tourist Office of Rhodes.
3 weekly ferries are travelling to Nisyros and Tilos.
2 ferries per week are linking Rhodes to Astypalaia, Kassos, Karpathos and Ibiza.
There are daily boats from Pireaus that generally leave between the hours of 1pm and 6pm. You can get a schedule in the Athens News which comes out every Friday with the weekly ferry schedules and the Kathemerini Insert in the International Herald Tribune. If you are going deck chances are you can get a ticket at the boat but it is best to book in advance so there is no chance of being left behind. If you want a cabin, which is recommended since it is about a 17 hour trip, then do it through your travel agent. The ferry makes stops at Patmos, Kalymnos, Leros and Kos too or various combintaions of these islands. There are infrequent connections to Santorini, Mykonos, Crete and some other islands but not every day. The most popular boat is the Blue Star which takes about 13 to 15 hours they say. The Anthi Maria costs only 17 euro from Piraus but does not have cabins. There is a once a week ferry to Samos, Chios, Lesvos, Limnos and Thessaloniki.Greek Ferries are the primary means of transport to and from the islands, and the trip is an experience to be savored, like a cruise (sometimes). Islands like Lesvos, Rhodes and Crete are best reached by ferry because the trip is overnight and it’s like being in a big moving hotel. A really nice cabin for two should cost about 120 euros or so. Santorini should be appoached by ferry for the view which is breathtaking and worth the 8-10 hour trip, especially if you can get there in the lateafternoon. Unless of course you don’t like being on boats in which case no view is worth 8-10 hours of boredom punctuated by the arrivals and departures from the other islands on the Santorini route.
There are ferries and excursions boats that go to the nearby islands of Simi, Kastelorizo, Kos, Kalymnos, Patmos, Tilos and Leros and these are usually highspeeds. You can do daytrips to the closer islands or overnight trips or even bounce your way back to Pireaus if the schedules work in your favor. These boats leave from Mandraki harbor and you can go there and get schedules or arrange trips through one of the local travel agents. There are also cruises to Lindos (highspeed or slow boat, take your pick) and other places around the island.
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