The calculated distance (air line) between Rocourt and Woluwe-Saint-Lambert is approximately 50 miles respectively 81 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 Rocourt and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles