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