Belgium has one national airport conveniently located at the east of Brussels.  Smaller airlines are redirecting their flights more and more to regional airports (Antwerp, Charleroi, Ostend, Liège...). 

As Belgium is a small country, most distances can be covered in a short period of time, by train or by car.  Belgium has a good road system and a very dense motorway network, which is at the crossroads of all its neighbouring countries.  The SNCB is the Belgian national railway network ; it offers relatively cheap transport on a dense number of lines. 

The Eurostar is a relatively new part of the railway system which allows fast travel to major cities in Europe.