The calculated distance (air line) between Pithiviers and Marne La Vallée is approximately 49 miles respectively 79 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 Pithiviers and Marne La Vallée has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles