The calculated distance (air line) between El Galpón and San Miguel de Tucumán is approximately 106 miles respectively 170 kilometers.
By car or train, the actual journey to San Miguel de Tucumán is certainly longer, as only the direct route (as the crow flies) between El Galpón and San Miguel de Tucumán has been calculated here.
Air line (approximately)
170 kilometers
92 nautical miles