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