The calculated distance (air line) between Ponthierry and Marne La Vallée is approximately 21 miles respectively 34 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 Ponthierry and Marne La Vallée has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles