The calculated distance (air line) between Berchem-Sainte-Agathe and Ostend is approximately 64 miles respectively 103 kilometers.
By car or train, the actual journey to Ostend is certainly longer, as only the direct route (as the crow flies) between Berchem-Sainte-Agathe and Ostend has been calculated here.
Air line (approximately)
103 kilometers
56 nautical miles