The calculated distance (air line) between Dol-de-Bretagne and Le Havre is approximately 107 miles respectively 171 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Dol-de-Bretagne and Le Havre has been calculated here.
Air line (approximately)
171 kilometers
92 nautical miles