Cost of living in Santiago de Compostela (Spain) is 18% cheaper than in Andorra la Vella (Andorra)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 235 prices entered by 22 different people.
For example, to keep the same standard of living that would require €3,000 in Andorra la Vella you would need to make just about €2,462 in Santiago de Compostela.