The calculated distance (air line) between Garges-lès-Gonesse and Le Havre is approximately 110 miles respectively 176 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Garges-lès-Gonesse and Le Havre has been calculated here.
Air line (approximately)
176 kilometers
95 nautical miles