The calculated distance (air line) between Saint-Valery-en-Caux and Amiens is approximately 70 miles respectively 112 kilometers.
By car or train, the actual journey to Amiens is certainly longer, as only the direct route (as the crow flies) between Saint-Valery-en-Caux and Amiens has been calculated here.
Air line (approximately)
112 kilometers
61 nautical miles