Short or longer break to Sofia from Thessaloniki by train from 25 euros!!! return trip with OSE.
A special price of 25 Euros for return tickets is also available on the route Thessaloniki- Sofia, provided the ticket was purchased at least 15 days prior to travel. The offer is available for a limited number of seats.
* Stops only for internal passengers
For 0 euros check couchsurfing.org
Also check airbnb.com it might get much cheaper and more cozy from hostels and hotels.
- More info about how and where to book the trip here.
- Info about the public transport in Sofia here
- Try Sofia during the summer ;)
- Climb up the Vitosha mountain!