In the event of a flight cancellation, the air carrier in charge of making the flight must inform passengers at least 14 days in advance. However, the passenger will not be entitled to compensation if the airline can demonstrate that the cancellation is due to extraordinary circumstances beyond its control. You have all the information in: «Air passenger rights: how to make a claim to Aena«.
You have all the information in: "Air passenger rights: how to make a claim to Aena".