Assalam won their first promotion to 2019 LFA Primeira, with one match to spare following a 4–0 win over Lalenok United on 28 June 2018.
Lalenok United won their first promotion to LFA Primeira, with one match to spare following their competitor Sporting only playing a 1–1 draw against Lica-Lica on 17 July 2018.
Santa Cruz became the first team to be relegated from LFA Segunda after losing 2–3 in their last match against Zebra on 31 July 2018.
FC Café and Sport Dili e Benfica were relegated from 2017 Segunda Divisao after finished 5th and bottom place of Group A, while YMCA FC and União de Timor were relegated from 2017 Segunda Divisao after finished 6th and bottom place of Group B. FC Zebra and Porto Taibesse were relegated to 2018 LFA Segunda after finished 7th and bottom place of 2017 Primeira Divisao.
Fitun Estudante (FIEL), Lalenok United and FC Lero promoted to 2018 LFA Segunda after win the playoff tournament.