The calculated distance (air line) between Ostend and Woluwe-Saint-Lambert is approximately 70 miles respectively 113 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 Ostend and Woluwe-Saint-Lambert has been calculated here.
Air line (approximately)
113 kilometers
61 nautical miles