Cacusan to be the first team who relegated to 2019 LFA Segunda, with four match to spare following a 0–10 loss against Karketu on 30 June 2018.
DIT was the second team got relegated to 2019 LFA Segunda, with two match to spare following a 2–4 loss against Ponta Leste on 13 July 2018.
returned to top flight after last season relegated to Segunda Divisao and Atlético Ultramar was newly promotion clubs.
Name on BOLD was foreign players who registered in mid-season transfer window.
Due to Timor-Leste national under-21 team schedule in April 2018 for their participation in the 2018 Hassanal Bolkiah Trophy, Round 4 and Round 7 was rescheduled from originally on April 21–22 and May 26–27 in Malibaca Yamato Stadium, Maliana and Baucau Municipal Stadium, Baucau move to April 5–8 and June 7–10 in Kampo Demokrasia, Dili, while Round 6 rescheduled from May 17–20 in Kampo Demokrasia, Dili move to May 26–27 in Malibaca Yamato Stadium, Maliana and Baucau Municipal Stadium, Baucau, also Round 5 rescheduled from April 26–29 move to May 17–20 in same place.