The calculated distance (air line) between San Sebastián and Antiguo Cuscatlán is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Antiguo Cuscatlán is certainly longer, as only the direct route (as the crow flies) between San Sebastián and Antiguo Cuscatlán has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles