The calculated distance (air line) between Rosario de Mora and Zacatecoluca is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Zacatecoluca is certainly longer, as only the direct route (as the crow flies) between Rosario de Mora and Zacatecoluca has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles