KTEL Attika Buses
The Orange Buses take you to the countryside of Attiki outside Athens and it's suburbs. Tickets are
sold on board and don't need to be validated. Prices vary according to destination. The bus-stops are orange and have the initials KTEL. The final destination is written on the front of each bus. They usually leave every hour or so. They are very modern looking now and completely air-conditioned.
Most buses leave from the new bus terminal at the Nomismatokopio Metro Station which is on the Blue Line and go to Marathon, Markopoulo, Venizelos Airport, Lavrion, Nea Makri and Rafina (for ferries to Cyclades).See Rafina-Nea Makri-Marathon Schedules or Lavrio-Porto Rafti-Markopoulo-Airport Schedules
You can also use the buses to Sounion which leave from Pedhion Areas on Alexandras Ave, stopping in Syntagma Square and in coastal towns like Varkiza, Lagonissi, Saronida, and Anavissos where you can swim and go to seaside fish tavernas. See Sounion Schedule. Buses to Oropos and that area also leave from here as to the buses to Ag Apostoli. See Oropos Schedules and Ag Apostolis Schedules
The buses to Megara, Neos Peramos and Elefsina leave from the Thission Train station. See Megera Schedules You can also get the buses to Vilia and Erethres. See Vilia-Erethres Schedules
There is also a bus between the airport and Rafina. See schedules
For more information see the KTEL Attikis website.