The calculated distance (air line) between San Miguelito and Unión Chocó is approximately 148 miles respectively 238 kilometers.
By car or train, the actual journey to Unión Chocó is certainly longer, as only the direct route (as the crow flies) between San Miguelito and Unión Chocó has been calculated here.
Air line (approximately)
238 kilometers
129 nautical miles