The calculated distance (air line) between Les Clayes-sous-Bois and Cergy-Pontoise is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Les Clayes-sous-Bois and Cergy-Pontoise has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles