The calculated distance (air line) between Hérouville-Saint-Clair and Cergy-Pontoise is approximately 108 miles respectively 175 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Hérouville-Saint-Clair and Cergy-Pontoise has been calculated here.
Air line (approximately)
175 kilometers
94 nautical miles