The natural Kos port has frequent ferry services to and from the ports of Piraeus (Athens), Rhodes, Symi, Patmos, Kalymnos, and Nisyros. Less frequent service also connects Kos to the ports of Karpathos, Leros, Syros, Santorini, Astypalea, Amorgos, Kastelorizo, Leipsous, Tilos, and Halki.
Travel time from Piraeus to Kos is approximately 12 hours, while there is also ferry service to the neighboring Turkish port of Bodrum (30-40 minutes travel time), Nisyros, Kalymnos as well as to other Cycladic islands, Thessaloniki, Chios and Mytilini, with service time and dates vary depending on the time of year and volume of tourist traffic.
Kos Madraki is located on the south side of Kos Harbour with 80 berths for mooring vessels up to 70m and is managed as an extension by Marina of Kos.