We opted to travel to the airport by bus. The designated airport bus terminal opposite Syntagma Square is a small ticket booth to purchase bus tickets and a pickup stop.
How to get to Athens International Airport: Taxi can be hailed at anywhere in the capital center. Alternatively, Bus from Athens Syntagma Square (along Othonos opposite Syntagma Square) to Athens International Airport – Airport bus from Terminal X95. Visit Athens Airport Bus for updated information.
Glad to have trusted our gut feeling to purchase our bus tickets ahead. On the day of our departure, the ticket booth was closed. There was no signage of where exactly the bus stop is or opening hours of the ticket booth. We assumed that the pickup[ stop is by the ticketing booth and waited for the bus there.