The calculated distance (air line) between Le Havre and Dives-sur-Mer is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Dives-sur-Mer is certainly longer, as only the direct route (as the crow flies) between Le Havre and Dives-sur-Mer has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles