The calculated distance (air line) between San Agustín Acasaguastlán and Mixco is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Mixco is certainly longer, as only the direct route (as the crow flies) between San Agustín Acasaguastlán and Mixco has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles