The calculated distance (air line) between Saint-Philbert-de-Grand-Lieu and Le Mans is approximately 109 miles respectively 175 kilometers.
By car or train, the actual journey to Le Mans is certainly longer, as only the direct route (as the crow flies) between Saint-Philbert-de-Grand-Lieu and Le Mans has been calculated here.
Air line (approximately)
175 kilometers
95 nautical miles