The calculated distance (air line) between Tonacatepeque and Ahuachapán is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Ahuachapán is certainly longer, as only the direct route (as the crow flies) between Tonacatepeque and Ahuachapán has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles