You can cancel your flight with Iberia Airlines. Iberia's cancellation policy states that non-refundable tickets need payment of a cancellation fee based on fare type, travel class, and cancellation period. In an emergency, refundable tickets may be more useful.

To avoid cancellation costs, cancel your Iberia reservation during the 24-hour window. If the airline cancels your flight and you are dissatisfied with the rescheduled flight, you have the right to request full payment.
https://flightcancellationpoli....cy.com/iberia-cancel