The calculated distance (air line) between Montchanin and Marne La Vallée is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Marne La Vallée is certainly longer, as only the direct route (as the crow flies) between Montchanin and Marne La Vallée has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles