The calculated distance (air line) between Louvain-la-Neuve and La Louvière is approximately 23 miles respectively 36 kilometers.
By car or train, the actual journey to La Louvière is certainly longer, as only the direct route (as the crow flies) between Louvain-la-Neuve and La Louvière has been calculated here.
Air line (approximately)
36 kilometers
20 nautical miles