After two semi-finals and a final which took place in February and March 2019, "Telemóveis" performed by Conan Osíris emerged as the winner after achieving the highest score following the combination of votes from seven regional juries and a public televote.

[1] Portugal had won the contest on one occasion: in 2017 with the song "Amar pelos dois" performed by Salvador Sobral.

Portugal's least successful result has been last place, which they have achieved on four occasions, most recently in 2018 with the song "O jardim" performed by Cláudia Pascoal.

Sixteen entries competed in the competition that consisted of two semi-finals held on 16 and 23 February 2019 leading to an eight-song final on 2 March 2019.

[5] Results during the semi-finals were determined by the 50/50 combination of votes from a jury panel appointed by RTP and public televoting, while results during the final were determined by the 50/50 combination of votes from seven regional juries and public televoting, which was opened following the second semi-final and closed during the final show.

[6][7] The composers, which both created the songs and selected its performers, were required to submit the demo and final versions of their entries by 30 November and 31 December 2018, respectively.

In each semi-final eight entries competed and four advanced to the final based on the 50/50 combination of votes of a jury panel consisting of Júlio Isidro, Álvaro Costa, Isaura, Maria João, Pedro Penim, Rita Redshoes and Selma Uamusse, and a public televote.

[16] The eight entries that qualified from the two preceding semi-finals competed and the winner, "Telemóveis" performed by Conan Osíris, was selected based on the 50/50 combination of votes of seven regional juries and a public televote.

The Portuguese performance featured Conan Osíris wearing a green kimono robe with a large ear piece, designed by designer Ruben Osório, performing a choreographed routine on a small staircase with dancer João Reis Moreira, also dressed in green.

Each nation's jury consisted of five music industry professionals who are citizens of the country they represent, with their names published before the contest to ensure transparency.

This jury judged each entry based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.