The calculated distance (air line) between La Unión and Antiguo Cuscatlán is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Antiguo Cuscatlán is certainly longer, as only the direct route (as the crow flies) between La Unión and Antiguo Cuscatlán has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles