The calculated distance (air line) between Quartier Militaire and Fond du Sac is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Fond du Sac is certainly longer, as only the direct route (as the crow flies) between Quartier Militaire and Fond du Sac has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles