Alianza Atlético were champions of the 2020 Liga 2, gaining promotion back to the Peruvian Primera División where they still stand.

A group of brave and enterprising citizens of Sullana met on January 18, 1920 at the home of Don José Taboada More, located on the fourth block of Grau Street in the heart of the Norte neighborhood of Sullana, and founded a sports institution that over time would become one of the best in all of Northern Peru, which they called Club Sport Alianza.

In this period, according to a compilation made by the newspaper El Tiempo some years ago, the Regional Championship won in Chiclayo in 1946 against the local Juan Aurich, the Alfonso Ugarte de Chiclín and the Octavio Espinoza of Ica, in a quadrangular that could be considered a kind of outline of what two decades later would be consolidated as the Copa Perú.

The golden age of the club came to a close with the title of a departmental quadrangular held in Talara, for the inauguration of the Estadio Campeonísimo, in 1949.

The champions of four Piuran provinces participated: Gardel from Talara, Estrella Roja from Piura, Sport Arequipa from Negritos and Alianza Atlético, which won the cup thanks to its great figure of those years: the forward Mercedes Ubillús, better known as 'Negro Meche'.

In 1967, they won the departmental title of champion of the Copa Perú by defeating Juan de Mori from Catacaos at the Estadio Miguel Grau in Piura, which allowed them to reach the Regional Stage of the tournament.

They faced Los Espartanos from Pacasmayo, Universitario from Tacna, Bella Esperanza from Cañete, Guardia Republicana and Deportivo Educación from Abancay.

In 1989 it was near to classify to the Copa Libertadores of America, falling 2–0 before Sporting Cristal in an extra match that defined the Regional Tournament.

After the end of the era of regional championships in the First Division, the Churres were generally placed in the last positions, with some exceptions such as when they managed to qualify for the Copa Sudamericana and some others.

For this reason, in the 2011 season, after another campaign in which they did not have a good time, in addition to being a rather eventful tournament, the Sullanenses together with Colegio Nacional de Iquitos were relegated to the Peruvian Segunda División.

These rivalries are known as the Although Alianza Atlético is the biggest team in Sullana, it has always faced Jorge Chávez as a bitter historical rival.