Billings played his 50th AFL game against Carlton in Round 8, 2017, managing 30 disposals, 12 marks and 5 goals.

[9] In August 2017, Billings signed a two-year contract extension, to remain at the club until the end of 2019.

[10] After a slump in form in the first half of the 2018 season, Billings was dropped from St Kilda's senior team to their VFL affiliate Sandringham.

[11][12] Prior to the 2019 season, Billings was elevated to St Kilda's leadership group after teammate Dylan Roberton was sidelined with a heart condition.

[17] Following a downturn in form and injury which led to him only playing 11 games in 2022 and 2023, he was traded to Melbourne after the 2023 AFL season.