Public Transport
The Athens public transport system covers most of the city and suburbs. You can use all means of public transport using the same ticket (a single ticket costs €1.20 and is valid for 90 minutes).
Athens Metro The Athens Metro system has 3 lines and connects to the tram, bus routes, and suburban railway. Runs daily from 5 am to midnight. Lines 2 and 3 operate until 2 a.m. on Fridays and Saturdays. At peak hours, trains run every 5-6 minutes.
Athens Piraeus Electric Railways
https://stasy.gr/en/
Line 1 is an overground train that runs from Kifissia to the port of Piraeus. It connects to lines 2 and 3 at three stations (Attiki, Omonia and Monastiraki).
Athens Suburban Railway
https://www.hellenictrain.gr/en/athens-suburban-and-regional-railway
This overground train directly links Piraeus port and Athens International Airport and operates from 4:30 am until 11 pm daily.
Buses & Trolleybuses
The Athens bus and trolleybus network is very extensive. Most buses and trolleybuses run daily from 5 am to midnight, and you can check the time of your route through the following link http://telematics.oasa.gr/en/#main
Tram
The tram network connects central Athens with the coastal suburbs of Faliro, Voula and Piraeus. It takes approximately one hour to get from Syntagma Square to the final seaside stops at Voula or Piraeus.
The tram connects to the Metro and overground train at four stops: Syntagma, Syngrou/Fix, Neos Kosmos and SEF (Peace and Friendship Stadium in Faliro). See the timetable here.
The tram operates from 5:30 am to 12:00 am daily.