The calculated distance (air line) between Mantes-la-Ville and Cergy-Pontoise is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Mantes-la-Ville and Cergy-Pontoise has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles