The calculated distance (air line) between La Seu d'Urgell and Saint-Girons is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Saint-Girons is certainly longer, as only the direct route (as the crow flies) between La Seu d'Urgell and Saint-Girons has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles