Leros is connected with ferries from Piraeus to the Dodecanese Islands Patmos, Leros, Kalymnos, Kos, Symi, Nisyros, Tilos and Rhodes. The main ferry companies serving Leros are the Bluestar II and the Superfast ferry.
Leros throughout the year is connected with the other islands of the Dodecanese with the catamarans of the ferry company www.12ne.gr and its fast catamarans Dodekanisos Express and Dodekanisos Pride, arriving daily in Leros at 12 noon from Rhodes, Kos, Kalymnos to Lipsi and Patmos and Departure on 2.45 about for Kalymnos, Kos, Nisyros, Rhodes. There are sailings to Symi 1-2 times a week. There are also itineraries for Lipsi, Patmos, Agathonisi and Kalymnos with the small ferry Kalymnos. In the summer there is also a route from Patmos with the Patmos star and from and to Lipsi with Anna Express.
You can book your tickets to Leros on line with ferries gr, here