The calculated distance (air line) between Retie and Woluwe-Saint-Lambert is approximately 41 miles respectively 66 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 Retie and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
66 kilometers
35 nautical miles