The calculated distance (air line) between Solsona and La Seu d'Urgell is approximately 25 miles respectively 41 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 Solsona and La Seu d'Urgell has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles