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