You will travel to and from Agios Efstratios by boat for about 5 to 10 hours depending on departure or arrival port, as well as from the number of islands that your ship will stop.
The routes which currently exist are the following, but it is wiser to ask agents about any changes that may occur.
Piraeus - Andros - Skyros - Agios Efstratios -Mytilini
Volos - Skiathos - Skopelos - Agios Efstratios - Limnos
Thessaloniki - Limnos - Agios Efstratios - Mytilini
Kavala - Thassos - Agios Efstratios - Skyros
Kavala - Thassos - Agios Efstratios - Mytilini