How to get to Kythnos
There are regular ferries between the port of Lavrion (60km from Athens center).
During the summer season there are at least 2 ferries both ways, one in the morning and one early in the afternoon.
The trip takes approx. 2 hours.
If you arrive at the International airport of Athens there are 2 options to go to Lavrion Port (approx. 37km):
By public bus (KTEL): departing every 2 hours which takes about 50 min. with a stop over in Markopoulos.
By Taxi: The cost is approx. 40 Euro and it takes 40 min. depending on the traffic.
For an accurate check on ferry schedules you can visit www.openseas.gr.