The calculated distance (air line) between Montigny-lès-Cormeilles and Saint-Gratien is approximately 4 miles respectively 6 kilometers.
By car or train, the actual journey to Saint-Gratien is certainly longer, as only the direct route (as the crow flies) between Montigny-lès-Cormeilles and Saint-Gratien has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles