The calculated distance (air line) between Santiago de los Caballeros and Boca Chica is approximately 100 miles respectively 160 kilometers.
By car or train, the actual journey to Boca Chica is certainly longer, as only the direct route (as the crow flies) between Santiago de los Caballeros and Boca Chica has been calculated here.
Air line (approximately)
160 kilometers
87 nautical miles