The calculated distance (air line) between Duisburg and Woluwe-Saint-Lambert is approximately 109 miles respectively 176 kilometers.
By car or train, the actual journey to Woluwe-Saint-Lambert is certainly longer, as only the direct route (as the crow flies) between Duisburg and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
176 kilometers
95 nautical miles