The calculated distance (air line) between Courcelles-lès-Lens and Le Havre is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Courcelles-lès-Lens and Le Havre has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles