The calculated distance (air line) between Fléron and Woluwe-Saint-Lambert is approximately 57 miles respectively 92 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 Fléron and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
92 kilometers
49 nautical miles