The calculated distance (air line) between Cergy-Pontoise and Noisy-le-Grand is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Noisy-le-Grand is certainly longer, as only the direct route (as the crow flies) between Cergy-Pontoise and Noisy-le-Grand has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles