The calculated distance (air line) between Cergy-Pontoise and Cormeilles-en-Parisis is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Cormeilles-en-Parisis is certainly longer, as only the direct route (as the crow flies) between Cergy-Pontoise and Cormeilles-en-Parisis has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles