The calculated distance (air line) between Croissy-sur-Seine and Marne La Vallée is approximately 23 miles respectively 37 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 Croissy-sur-Seine and Marne La Vallée has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles