Buses to Thessaloniki, the Peloponnese, Ionian Islands and destinations in western Greece such as Igoumenitsa, Ioannina, Kastoria and Edessa. Local bus 051 goes to central Athens (junction of Zinonos and Menandrou, near Omonia) every 20 minutes from 5am to midnight. Local bus X93 goes to/from the airport. Local bus 420 goes to/from Piraeus (junction of Akti Kondili and Thermopilon).
Taxis to Syntagma cost about €16 (€28 at night).