The calculated distance (air line) between Wezembeek-Oppem and Antwerpen is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Antwerpen is certainly longer, as only the direct route (as the crow flies) between Wezembeek-Oppem and Antwerpen has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles