The ships for KEA depart the harbor of LAVRION and the trip takes only 1 hour. Furthermore, 

Kea is connected by boat with all the islands of the Cyclades.

Itineraries between Lavrion - Kea are taking place daily.

By Car
One can reach Lavrion via Attica road as well as via the coastal road (Poseidonos) via Athens - Souniou avenue.

From the Railway station "Stathmos Larissis"
Outside the railway station, one can find the metro station (underground). One should stop in Omonoia station and take the line to Kifisia. On the first stop (Victoria station) come off the train, walk around 100 meters up to "Pedion toy Areos" where buses for Lavrion can be found. 
They are leaving every half hour. 
Information: 2108230179 and 2108213203.
From the harbor of Lavrion one can take the ferry boat to Kea.

From the airport Eleftherios Venizelos
"ATTIKA KTEL" buses leave the airport and reach Lavrion, via Markopoulo Attica Avenue.

From Athens (Omonoia)
From Omonoia square one can take the electric railway, and follow the line to Kifisia. On Victoria station come off the train, walk around 100 meters up to "Pedion toy Areos" where buses for Lavrion can be found. They are leaving every half hour.
Information: 2108230179 and 2108213203.
From the harbor of Lavrion one can take the ferry boat to Kea.

From the harbor of Piraeus
One can take the electric railway, and follow the line to Kifisia. On Victoria station come off the train, walk around 100 meters up to "Pedion toy Areos" where buses for Lavrion can be found. They are leaving every half hour.
Information: 2108230179 and 2108213203.
From the harbor of Lavrion you take the ferry boat to Kea.