| 2026-10-10 | UFC Fight Night: Allen vs. Duncan | Catchweight | Loopy Godínez def. Ketlen Souza | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2026-06-06 | UFC Fight Night: Muhammad vs. Bonfim | Women’s Strawweight | Ketlen Souza def. Ariane Carnelossi | KO (punches and head kick) | 1 | 1:34 |
| 2026-02-07 | UFC Fight Night: Bautista vs. Oliveira | Women’s Strawweight | Ketlen Souza def. Bruna Brasil | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2025-08-02 | UFC on ESPN: Taira vs. Park | Women’s Strawweight | Piera Rodríguez def. Ketlen Souza | Decision (split) (29–28, 28–29, 29–28) | 3 | 5:00 |
| 2025-02-15 | UFC Fight Night: Cannonier vs. Rodrigues | Women’s Strawweight | Angela Hill def. Ketlen Souza | Decision (split) (29–28, 28–29, 29–28) | 3 | 5:00 |
| 2024-09-14 | UFC 306: O'Malley vs. Dvalishvili | Women’s Strawweight | Ketlen Souza def. Yazmin Jauregui | Technical Submission (rear-naked choke) | 1 | 3:02 |
| 2024-04-27 | UFC on ESPN: Nicolau vs. Perez | Women’s Strawweight | Ketlen Souza def. Marnic Mann | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2023-06-03 | UFC on ESPN: Kara-France vs. Albazi | Women’s Flyweight | Karine Silva def. Ketlen Souza | Submission (kneebar) | 1 | 1:45 |