The calculated distance (air line) between Bois-Colombes and Marne La Vallée is approximately 18 miles respectively 28 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 Bois-Colombes and Marne La Vallée has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles