The calculated distance (air line) between Méry-sur-Oise and Soisy-sous-Montmorency is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Soisy-sous-Montmorency is certainly longer, as only the direct route (as the crow flies) between Méry-sur-Oise and Soisy-sous-Montmorency has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles