Scheduled ferries and hydrofoils leave from Volos, Agios Constantinos, Kymi and Thessaloniki in the summer season.
There is a convenient bus service from central Athens to Agios Constantinos connecting with the hydrofoil to Skiathos

www.ferries.gr
www.gtp.gr
www.forth-crs.gr
www.hellenicseaways.gr
www.openseas.gr