The calculated distance (air line) between La Courneuve and Marne La Vallée is approximately 13 miles respectively 21 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 La Courneuve and Marne La Vallée has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles