The calculated distance (air line) between Hérouville-Saint-Clair and Le Havre is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Hérouville-Saint-Clair and Le Havre has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles