The calculated distance (air line) between la Massana and La Seu d'Urgell is approximately 13 miles respectively 21 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 la Massana and La Seu d'Urgell has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles