The calculated distance (air line) between Sint-Katelijne-Waver and Leuven is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Leuven is certainly longer, as only the direct route (as the crow flies) between Sint-Katelijne-Waver and Leuven has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles