The calculated distance (air line) between Saint-Gilles-Croix-de-Vie and Le Mans is approximately 135 miles respectively 217 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-Gilles-Croix-de-Vie and Le Mans has been calculated here.
Air line (approximately)
217 kilometers
117 nautical miles