The ticket is the contract of transport between the airline and the passenger whose name is shown on the ticket. A ticket is valid to travel for 12 months and for reimbursement for 18 months. This validity applies as long as the fare allows it.
These 12 or 18 months start to count:
If your request is related to a flight date change, itinerary change or change of the maximum stay in the destination, contact any Iberia office to check the conditions of the fare purchased. If your ticket was issued by a travel agency and you have not yet begun your trip, contact the agency.