The calculated distance (air line) between Ermont and Le Plessis-Bouchard is approximately 1 miles respectively 2 kilometers.
By car or train, the actual journey to Le Plessis-Bouchard is certainly longer, as only the direct route (as the crow flies) between Ermont and Le Plessis-Bouchard has been calculated here.
Air line (approximately)
2 kilometers
1 nautical miles