Ffion Williams has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2023 | Marathon | 2:58:01 | 2570 | |
| TCS London Marathon 2022 | Marathon | 6:16:24 | 37954 | |
| BMW Berlin Marathon 2022 | Marathon | 3:01:51 | 198 | |
| BMW Berlin Marathon 2022 | Marathon | 4:11:42 | 4404 |