The calculated distance (air line) between Mons-en-Barœul and Paris 15 Vaugirard is approximately 129 miles respectively 208 kilometers.
By car or train, the actual journey to Paris 15 Vaugirard is certainly longer, as only the direct route (as the crow flies) between Mons-en-Barœul and Paris 15 Vaugirard has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles