The calculated distance (air line) between Saint-Josse-ten-Noode and Ostend is approximately 68 miles respectively 109 kilometers.
By car or train, the actual journey to Ostend is certainly longer, as only the direct route (as the crow flies) between Saint-Josse-ten-Noode and Ostend has been calculated here.
Air line (approximately)
109 kilometers
59 nautical miles