The calculated distance (air line) between Nogent-sur-Oise and Saint-Quentin-en-Yvelines is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Saint-Quentin-en-Yvelines is certainly longer, as only the direct route (as the crow flies) between Nogent-sur-Oise and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles