The calculated distance (air line) between Bois-le-Roi and Marne La Vallée is approximately 25 miles respectively 41 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 Bois-le-Roi and Marne La Vallée has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles