The calculated distance (air line) between Sint-Katelijne-Waver and Ixelles is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Ixelles is certainly longer, as only the direct route (as the crow flies) between Sint-Katelijne-Waver and Ixelles has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles