The calculated distance (air line) between Saint-Ouen and Marne La Vallée is approximately 15 miles respectively 24 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 Saint-Ouen and Marne La Vallée has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles