The calculated distance (air line) between Boncelles and Woluwe-Saint-Lambert is approximately 52 miles respectively 84 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 Boncelles and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles