You can pay for your purchases with Avios through the flight finder on Iberia.com. Once you have chosen your origin/destination and travel dates, the option “Pay with Avios”will appear. You can also log in from “Iberia Plus > Avios > Use My Avios”, or alternatively call your Iberia Plus Service Centre.
Another option is to combine Avios and cash; sign in and go the payment page, where you'll see the option of paying part of the amount in Avios, with different amounts and their equivalence in euros for you to choose whichever suits you best.
If you belong to the loyalty programme of another airline in the oneworld Alliance, you must make your booking through their website or call centre.
Tickets obtained with Avios do not generate Avios.