The calculated distance (air line) between Fenain and Paris 18 Buttes-Montmartre is approximately 110 miles respectively 178 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 Fenain and Paris 18 Buttes-Montmartre has been calculated here.
Air line (approximately)
178 kilometers
96 nautical miles