If you need to cancel your flight for whatever reason, you can do so by going to TheAirlinesInfo's official website, where you can read a blog post on Iberia Airlines cancellation policy. According to this, you can cancel your flight within 24 hours and then get a full refund. Your flight cancellation fee will be waived if you need to cancel due to illness or a death in the family. To back up your claim, you need the appropriate documentation.