The calculated distance (air line) between Saint-Leu-la-Forêt and Le Havre is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Saint-Leu-la-Forêt and Le Havre has been calculated here.
Air line (approximately)
164 kilometers
89 nautical miles