The season began on 14 February and is scheduled to end on 7 December 2025.
16 teams take part in the league in this season: the top 14 teams from the 2024 tournament, plus the 2024 Primera B champions Deportes La Serena and Deportes Limache, winners of the promotion play-offs.
La Serena secured promotion to the top tier after two years on 29 September 2024, winning the Primera B tournament with a 1–0 win over Deportes Recoleta.
[4] Meanwhile, Deportes Limache achieved a first-ever promotion to Primera División on 7 December 2024, after defeating Rangers on penalties in the promotion play-offs finals.
[5] The promoted teams replaced Cobreloa and Deportes Copiapó, who were relegated to Primera B at the end of the 2024 season.