The calculated distance (air line) between Chalchuapa and Antiguo Cuscatlán is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Antiguo Cuscatlán is certainly longer, as only the direct route (as the crow flies) between Chalchuapa and Antiguo Cuscatlán has been calculated here.
Air line (approximately)
58 kilometers
32 nautical miles