Mitra Kukar , Sriwijaya , and PSMS were relegated to the Liga 2 for the 2019 season , while PSS , Semen Padang , and Kalteng Putra as winners , runners-up , and third-place play-off winners respectively , were promoted from the 2018 Liga 2 season.a : Founding member of the Indonesia Super League/Liga 1b : Never been relegated from Indonesia Super League/Liga 1
Semen Padang was promoted in the 2018 Liga 2 season .