The requirements currently in force for entering Spanish territory are described at the website of the Ministry of Foreign Affairs and Cooperation.
Reaching A Coruña
The airport of A Coruña (IATA: LCG) is located 10 km away from the city of A Coruña and it can be reached from Madrid, Barcelona, Sevilla, Valencia and London (Heathrow).
The airport of Santiago de Compostela (IATA: SCQ) can be reached from Amsterdam, Brussels, Dublin, Frankfurt, London, Milan, Rome, and many others. The city of Santiago de Compostela is located 50 km away from A Coruña and it is very well connected to A Coruña by train.