For the Azores, children under 11 years old do not pay

Travel just for the cost of airport taxes. 

On trips between Lisbon or Porto to Ponta Delgada or Terceira children only pay airport taxes.

This promotion is valid for direct flights to Ponta Delgada and Terceira, from Oporto and Lisbon and vice-versa (except Oporto-Terceira, which allows the connection via Lisbon). Each adult may travel with one child up to 23 months and one child from 24 months to 11 years of age. 

This offer is available from 5 to 18 August, for flights to be made from 1 October to 15 November.

All the information about the campaign can be found here: https://www.flytap.com/en-pt/promo/kids-travel-free-azores.

TAP always offers free cabin transport of one personal item and hand luggage on all fares, including Discount.