The calculated distance (air line) between Andorra la Vella and Puigcerdà is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Puigcerdà is certainly longer, as only the direct route (as the crow flies) between Andorra la Vella and Puigcerdà has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles