The calculated distance (air line) between San Martín Jilotepeque and Zacapa is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Zacapa is certainly longer, as only the direct route (as the crow flies) between San Martín Jilotepeque and Zacapa has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles