Must purchase by 12/31/22 with a return flight no later than 06/30/23. You can use it for any purchase on Iberia.com, except for Iberia Vacaciones packages: Flight+Hotel or Flight+Car.
Voucher code can be used at checkout. Once you have selected your flight and reached the payment screen, on the right-hand side you'll see a space with the words 'Do you have a voucher, discount code or gift card?'. You can enter the voucher code exactly as you received it, bearing in mind any uppercase, lowercase or special characters. Select 'Apply' and that's it!
You will see the new price payable: zero if the amount of the selected flight is less than or equal to your voucher balance; and the difference if the purchase amount is greater than your voucher balance.
If you don't spend the entire balance of your Iberia voucher, you can continue redeeming against for future purchases until you use it up.