The calculated distance (air line) between Sannois and Montigny-lès-Cormeilles is approximately 2 miles respectively 4 kilometers.
By car or train, the actual journey to Montigny-lès-Cormeilles is certainly longer, as only the direct route (as the crow flies) between Sannois and Montigny-lès-Cormeilles has been calculated here.
Air line (approximately)
4 kilometers
2 nautical miles