The calculated distance (air line) between Cesson-Sévigné and Le Havre is approximately 123 miles respectively 197 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Cesson-Sévigné and Le Havre has been calculated here.
Air line (approximately)
197 kilometers
107 nautical miles