The calculated distance (air line) between San Bartolomé Milpas Altas and Petapa is approximately 11 miles respectively 17 kilometers.
By car or train, the actual journey to Petapa is certainly longer, as only the direct route (as the crow flies) between San Bartolomé Milpas Altas and Petapa has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles