The calculated distance (air line) between Fontenay-le-Fleury and Marne La Vallée is approximately 27 miles respectively 44 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 Fontenay-le-Fleury and Marne La Vallée has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles