The calculated distance (air line) between Wattignies and Cergy-Pontoise is approximately 115 miles respectively 186 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Wattignies and Cergy-Pontoise has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles