The calculated distance (air line) between Le Mesnil-Esnard and Cergy-Pontoise is approximately 49 miles respectively 80 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Le Mesnil-Esnard and Cergy-Pontoise has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles