Thessaloniki - Brussels- Thessaloniki from 39,98 euros with our BFF www.ryanair.com
Brussels - Amsterdam - Brussels from 11 euros if you are under 25!! check www.eurolines.be/en/
For 0 euros check couchsurfing.org
Enough people to rent a flat? check airbnb.com it might get much cheaper and more cozy from hostels and hotels.
To and from Charleroi airport
It takes approximately 1 hour from Charleroi airport to Brussels. Check the official website here:
-Usually I take the city shuttle bus, it starts from 5 euros if you are lucky and cheaper when booked online. Check however the trains since there are several youth offers.
-Brussels worths spending half a day there! (be a tourist, try waffles and belgian fries!)
-Be fast, prices might change while i'm posting this text!
-Most of the hostels have higher price during the weekends so it might be cheaper to rent a flat.
-Double check your luggage size and don't forget to check in online and print your tickets!
-Check the Brussels' public transportation website and make sure you won't confuse the stations that you need to be due to their similar or double names (french/flamish)