The calculated distance (air line) between Vaux-sous-Chèvremont and Leuven is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Leuven is certainly longer, as only the direct route (as the crow flies) between Vaux-sous-Chèvremont and Leuven has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles