The calculated distance (air line) between Hérouville-Saint-Clair and Amiens is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Amiens is certainly longer, as only the direct route (as the crow flies) between Hérouville-Saint-Clair and Amiens has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles