The calculated distance (air line) between Saint-Leu-la-Forêt and Le Mans is approximately 117 miles respectively 188 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-Leu-la-Forêt and Le Mans has been calculated here.
Air line (approximately)
188 kilometers
102 nautical miles