Oneworld member Iberia is running a Black Friday sale promotion on various European markets. The most interesting offer seems to be domestic flights across Spain available from €20 one-way. The offer works until the end of the year and the validity of the Iberia gift card is one year. If interested simply follow the below link to this Iberia offer.
Purchase period: Up to November 30, 2021.
Travel period: From 11 January to 9 June 2022.
Periods not permitted: 07/04/22-19/04/22; 28/04/22-03/05/22; 12/05/22-17/05/22.
Taxes, carrier charges and administration fees all included. Launch the booking process to check prices from other origins. Offer subject to availability.