Eight songs ultimately qualified to compete in the final on 16 February 2019 where a public televote and a five-member jury panel selected "That Night" performed by Carousel as the winner.

In 2017 and 2018, Latvia had failed to qualify to the final for two consecutive years including with their 2018 entry "Funny Girl" performed by Laura Rizzotto.

After failing to produce successful entries those two years, LTV developed and had organised the Supernova national final since 2015.

In late August 2018, the broadcaster announced that they would organise Supernova 2019 in order to select the Latvian entry for the 2019 contest.

[7] Between 6 and 16 February 2019, the public was also able to vote for the eight finalists via the Overly mobile application, which was organised by LTV in cooperation with Alfa Park.

[8] In addition to selecting the Latvian entry for Eurovision, a monetary prize of €5,000 was awarded to the winning artist by the financial institution Ondo.lv.

[12] The jury panel for the auditions that determined the eighteen performers and songs while taking the results of the online vote into consideration consisted of Ilze Jansone (producer of Supernova), Agnese Cimuška-Rekke (Executive Director of the Latvian Music Development Society) and two members of the jury panel during the live shows: Artis Dvarionas and Rūdolfs Budze–DJ Rudd.

In each semi-final eight acts competed and four entries qualified to the final based on the combination of votes from a jury panel and the Latvian public.

On 28 January 2019, a special allocation draw was held which placed each country into one of the two semi-finals, as well as which half of the show they would perform in.

[23] The two semi-finals and the final were broadcast in Latvia on LTV1 with all shows featuring commentary by Toms Grēviņš and Ketija Šēnberga.

[26] The LED screens transitioned from dark tones to lighter hues including floating yellow bubbles and ultimately a bright orange sun.

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.

In addition, no member of a national jury was permitted to be related in any way to any of the competing acts in such a way that they cannot vote impartially and independently.