The calculated distance (air line) between Harlingen and Ciudad Gustavo Díaz Ordaz is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Ciudad Gustavo Díaz Ordaz is certainly longer, as only the direct route (as the crow flies) between Harlingen and Ciudad Gustavo Díaz Ordaz has been calculated here.
Air line (approximately)
90 kilometers
48 nautical miles