The calculated distance (air line) between Dives-sur-Mer and Cergy-Pontoise is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Dives-sur-Mer and Cergy-Pontoise has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles