The calculated distance (air line) between Arrasate / Mondragón and Pamplona is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Pamplona is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Pamplona has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles