The calculated distance (air line) between Château-Renault and Cergy-Pontoise is approximately 113 miles respectively 183 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Château-Renault and Cergy-Pontoise has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles