The calculated distance (air line) between Santa Catarina Ixtahuacán and Petapa is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Petapa is certainly longer, as only the direct route (as the crow flies) between Santa Catarina Ixtahuacán and Petapa has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles