The calculated distance (air line) between Quincy-sous-Sénart and Cergy-Pontoise is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Quincy-sous-Sénart and Cergy-Pontoise has been calculated here.
Air line (approximately)
53 kilometers
28 nautical miles