The calculated distance (air line) between Herblay and Saint-Ouen-l'Aumône is approximately 4 miles respectively 7 kilometers.
By car or train, the actual journey to Saint-Ouen-l'Aumône is certainly longer, as only the direct route (as the crow flies) between Herblay and Saint-Ouen-l'Aumône has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles