 First stage winners LDU Quito defeated second stage winners and defending champions Emelec 2–1 on aggregate in the final (third stage) to win their eleventh domestic title.Twelve teams competed in the 2018 Serie A season, ten of whom took part in the previous season.Clan Juvenil and Fuerza Amarilla were relegated from the Serie A after accumulating the fewest points during the 2017 season.