The calculated distance (air line) between Saint-Josse-ten-Noode and Liège is approximately 54 miles respectively 88 kilometers.
By car or train, the actual journey to Liège is certainly longer, as only the direct route (as the crow flies) between Saint-Josse-ten-Noode and Liège has been calculated here.
Air line (approximately)
88 kilometers
47 nautical miles