The calculated distance (air line) between Soisy-sous-Montmorency and Bessancourt is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to Bessancourt is certainly longer, as only the direct route (as the crow flies) between Soisy-sous-Montmorency and Bessancourt has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles