The calculated distance (air line) between Ermua and Laudio / Llodio is approximately 23 miles respectively 38 kilometers.
By car or train, the actual journey to Laudio / Llodio is certainly longer, as only the direct route (as the crow flies) between Ermua and Laudio / Llodio has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles