The calculated distance (air line) between Les Clayes-sous-Bois and Le Mesnil-Saint-Denis is approximately 6 miles respectively 9 kilometers.
By car or train, the actual journey to Le Mesnil-Saint-Denis is certainly longer, as only the direct route (as the crow flies) between Les Clayes-sous-Bois and Le Mesnil-Saint-Denis has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles