The calculated distance (air line) between Dortmund and Wezembeek-Oppem is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Wezembeek-Oppem is certainly longer, as only the direct route (as the crow flies) between Dortmund and Wezembeek-Oppem has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles