WOW! Ryanair offers very cheap flights within Greek cities. Thessaloniki from Athens (and vice versa) for only 4 EUR round trip!
February and March 2015.
How to book:
Baggage during the trip:
One carry-on luggage (55 × 40 × 20 cm, up to 10 kg) plus one small bag 35 × 20 × 20 cm.
Thanks to jotpol from Fly4free.pl for sharing this deal!