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, you can find the metro station (underground). Take the line M2 to Elliniko. On the fourth stop (Syntagma station) you have to change line and take the line M3 to Doukisis Plakentias. After 8 stops you get off at Nomismatokopio station where buses for Lavrion can be found. 
www.ktelattikis.gr 
Information: +30 2108808000.
Από το λιμάνι του Λαυρίου μπορεί κανείς να πάρει το ferry boat για την Κέα.

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

From Athens (Omonoia)
From Omonoia square you can find the metro station (underground). Take the line M2 to Elliniko. On the second stop (Syntagma station) you have to change line and take the line M3 to Doukisis Plakentias. After 8 stops you get off at Nomismatokopio station where buses for Lavrion can be found.

www.ktelattikis.gr 

Information: +30 2108808000
From the harbor of Lavrion one can take the ferry boat to Kea.

From the harbor of Piraeus
From Piraeus harbor you can find the metro station (underground). Take the line M3 to Doukisis Plakentias. After 18 stops you get off at Nomismatokopio station where buses for Lavrion can be found.

www.ktelattikis.gr 

Information: +30 2108808000
From the harbor of Lavrion you take the ferry boat to Kea.