The calculated distance (air line) between Saint-Josse-ten-Noode and Tournai is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Tournai is certainly longer, as only the direct route (as the crow flies) between Saint-Josse-ten-Noode and Tournai has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles