The calculated distance (air line) between Lambres-lez-Douai and Le Havre is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Lambres-lez-Douai and Le Havre has been calculated here.
Air line (approximately)
233 kilometers
125 nautical miles