The calculated distance (air line) between Saint-Julien-de-Concelles and Le Mans is approximately 90 miles respectively 145 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-Julien-de-Concelles and Le Mans has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles