The calculated distance (air line) between Neuilly-sur-Marne and Le Havre is approximately 119 miles respectively 191 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Neuilly-sur-Marne and Le Havre has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles