The closest airport to Centre de Conference Albert Borschette is Brussels Bruxelles-National Airport, which is located in Brussels. If you plan on visiting or staying in this area, landing at Brussels Bruxelles-National Airport will be your best bet.
The best prices found on momondo for flights to Belgium are:
$123 per person with Ryanair
$871 per person with Turkish Airlines
$1,150 per person with Thai Airways