The calculated distance (air line) between Saint-Quentin-en-Yvelines and Tourcoing is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Tourcoing is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Tourcoing has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles