The calculated distance (air line) between Fontenay-Trésigny and Le Havre is approximately 136 miles respectively 219 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-Trésigny and Le Havre has been calculated here.
Air line (approximately)
219 kilometers
118 nautical miles