The calculated distance (air line) between Fontenay-le-Fleury and Le Havre is approximately 100 miles respectively 160 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Fontenay-le-Fleury and Le Havre has been calculated here.
Air line (approximately)
160 kilometers
86 nautical miles