The calculated distance (air line) between Château-Thierry and Marne La Vallée is approximately 37 miles respectively 60 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 Château-Thierry and Marne La Vallée has been calculated here.
Air line (approximately)
60 kilometers
33 nautical miles