| 2026-10-03 | UFC 332: Silva vs. Wang | Welterweight | Roberto Soldić def. Khaos Williams | Decision (unanimous) (29–28, 29–27, 29–27) | 3 | 5:00 |
| 2026-05-16 | UFC Fight Night: Allen vs. Costa | Welterweight | Khaos Williams def. Nikolay Veretennikov | TKO (punches) | 1 | 3:31 |
| 2025-06-07 | UFC 316: Dvalishvili vs. O'Malley 2 | Welterweight | Andreas Gustafsson def. Khaos Williams | Decision (unanimous) (30–27, 30–26, 30–26) | 3 | 5:00 |
| 2025-02-15 | UFC Fight Night: Cannonier vs. Rodrigues | Welterweight | Gabriel Bonfim def. Khaos Williams | Technical Submission (brabo choke) | 2 | 4:58 |
| 2024-05-18 | UFC Fight Night: Barboza vs. Murphy | Welterweight | Khaos Williams def. Carlston Harris | KO (punch) | 1 | 1:30 |
| 2023-05-06 | UFC 288: Sterling vs. Cejudo | Welterweight | Khaos Williams def. Rolando Bedoya | Decision (split) (27–30, 29–28, 29–28) | 3 | 5:00 |
| 2022-05-07 | UFC 274: Oliveira vs. Gaethje | Welterweight | Randy Brown def. Khaos Williams | Decision (split) (29–28, 28–29, 29–28) | 3 | 5:00 |
| 2021-11-13 | UFC Fight Night: Holloway vs. Rodríguez | Welterweight | Khaos Williams def. Miguel Baeza | TKO (punches) | 3 | 1:02 |
| 2021-06-19 | UFC on ESPN: The Korean Zombie vs. Ige | Welterweight | Khaos Williams def. Matthew Semelsberger | Decision (unanimous) (30–27, 29–28, 29–28) | 3 | 5:00 |
| 2020-12-19 | UFC Fight Night: Thompson vs. Neal | Welterweight | Michel Pereira def. Khaos Williams | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2020-11-14 | UFC Fight Night: Felder vs. dos Anjos | Catchweight | Khaos Williams def. Abdul Razak Alhassan | KO (punch) | 1 | 0:30 |
| 2020-02-08 | UFC 247: Jones vs. Reyes | Welterweight | Khaos Williams def. Alex Morono | KO (punches) | 1 | 0:27 |