The calculated distance (air line) between Saint-Jean-de-Luz and Azpeitia is approximately 34 miles respectively 54 kilometers.
By car or train, the actual journey to Azpeitia is certainly longer, as only the direct route (as the crow flies) between Saint-Jean-de-Luz and Azpeitia has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles