The calculated distance (air line) between Montigny-lès-Cormeilles and Franconville is approximately 2 miles respectively 2 kilometers.
By car or train, the actual journey to Franconville is certainly longer, as only the direct route (as the crow flies) between Montigny-lès-Cormeilles and Franconville has been calculated here.
Air line (approximately)
2 kilometers
1 nautical miles