@ Xeque :
I routinely fly from Charleroi to Italy (Rome, Bergamo, Treviso) or to Ireland and return, with Ryanair, for 60 euros at the most, and more often less (sometimes even for 8,02 euros, credit card fee included).
How could you do it more cheaply by train or even by coach ? And there are even no direct trains between Belgium and Italy ...
Note : Ireland as well as most European countries are all in the Euro zone - only Great Britain remains in its pound sterling hermitage ...