The calculated distance (air line) between Puigcerdà and La Seu d'Urgell is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to La Seu d'Urgell is certainly longer, as only the direct route (as the crow flies) between Puigcerdà and La Seu d'Urgell has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles