The calculated distance (air line) between Chatou and Marly-le-Roi is approximately 4 miles respectively 6 kilometers.
By car or train, the actual journey to Marly-le-Roi is certainly longer, as only the direct route (as the crow flies) between Chatou and Marly-le-Roi has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles