The calculated distance (air line) between Onze-Lieve-Vrouw-Waver and Ixelles is approximately 18 miles respectively 30 kilometers.
By car or train, the actual journey to Ixelles is certainly longer, as only the direct route (as the crow flies) between Onze-Lieve-Vrouw-Waver and Ixelles has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles