The calculated distance (air line) between Vaux-sous-Chèvremont and Ostend is approximately 125 miles respectively 202 kilometers.
By car or train, the actual journey to Ostend is certainly longer, as only the direct route (as the crow flies) between Vaux-sous-Chèvremont and Ostend has been calculated here.
Air line (approximately)
202 kilometers
109 nautical miles