The calculated distance (air line) between Le Mesnil-Esnard and Le Havre is approximately 47 miles respectively 76 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Le Mesnil-Esnard and Le Havre has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles