The calculated distance (air line) between Mons-en-Barœul and Marne La Vallée is approximately 126 miles respectively 203 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 Mons-en-Barœul and Marne La Vallée has been calculated here.
Air line (approximately)
203 kilometers
109 nautical miles