The calculated distance (air line) between Piedra Blanca and Boca Chica is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Boca Chica is certainly longer, as only the direct route (as the crow flies) between Piedra Blanca and Boca Chica has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles