The calculated distance (air line) between Rosario de Mora and Ahuachapán is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Ahuachapán is certainly longer, as only the direct route (as the crow flies) between Rosario de Mora and Ahuachapán has been calculated here.
Air line (approximately)
79 kilometers
42 nautical miles