*Club domestic league appearances and goals, correct as of 18:45, 10 November 2024 (UTC) ‡ National team caps and goals, correct as of 9 July 2023 (UTC)
After the Boston Breakers folded ahead of the 2018 season, Onumonu was selected by the Portland Thorns in the 2018 Dispersal Draft.[5] She was waived on 8 May 2019, after playing in eight games.[6][1]
Reign FC
On 14 May 2019, Onumonu signed with Reign FC as a National Team Replacement player.[7] After stellar performances, she earned a supplemental roster spot on 28 June.[8]
NJ/NY Gotham FC
On 17 January 2020, Onumonu was traded to Sky Blue FC.[9] She re-signed with the team on a one-year deal on 20 January 2022 based on her strong performance during the 2021 NWSL season, which saw her named to the Best XI Second Team.[10][11]
On 25 October 2022, Onumonu signed a new three-year contract that would keep her with Gotham FC through the 2025 season.[12]
Utah Royals
On 30 December 2023, Onumonu was traded to Utah Royals for $40,000 in allocation money.[13]
Montpellier HSC
On 9 September 2024, Montpellier HSC announced that they had signed Onumonu as a free agent.[14]
Onumonu was initially named as an alternate for Nigeria's squad at the 2024 Summer Olympics, but was later elevated to the full 18-player roster after Halimatu Ayinde dropped out due to injury.[17]