The calculated distance (air line) between Hersin-Coupigny and Paris 18 Buttes-Montmartre is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Paris 18 Buttes-Montmartre is certainly longer, as only the direct route (as the crow flies) between Hersin-Coupigny and Paris 18 Buttes-Montmartre has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles