The calculated distance (air line) between Arrasate / Mondragón and Barakaldo is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Barakaldo is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Barakaldo has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles