The calculated distance (air line) between Mons-en-Barœul and Cergy-Pontoise is approximately 119 miles respectively 192 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Mons-en-Barœul and Cergy-Pontoise has been calculated here.
Air line (approximately)
192 kilometers
104 nautical miles