By Ferry Boat:

Ferryboats connect the island with Volos and Agios Konstantinos (4hrs.and 30min). During the summer it has also connections with Thessaloniki and Kymi.At this moment two ferry companies are coming to Alonissos, GA Ferries & Hellas Ferries.

By Hydrofoils:

Hydrofoils connect the island with Volos and Agios Konstantinos(2hrs and 30min).These connections link also Alonissos to nearby Skopelos, Skiathos, Skyros, Evia, and to the Peninsula of Halkidiki.

For timetables and booking tickets on-line for both companies you can visit the following webpage