EVENT 304 Women Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Sophie Main | 04 | Mt Kelly | 4:27.59 |
| 4 | 3 | Katherine Bailey | 04 | Perth City | 4:27.40 |
| 5 | 2 | Scarlett Orchard | 03 | Mt Kelly | 4:27.47 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 6 | Kailyn Hall | 04 | Aberdeen Per | 4:24.75 |
| 2 | 10 | Emily Clarke | 97 | Loughboro Un | 4:18.73 |
| 3 | 14 | Tamryn Van Selm | 04 | Millfield | 4:16.37 |
| 4 | 18 | Leah Crisp | 01 | Bath NC | 4:12.26 |
| 5 | 16 | Rachel Anderson | 02 | Loughboro Un | 4:15.21 |
| 6 | 12 | Nikki Miller | 00 | Eastkilbride | 4:16.83 |
| 7 | 8 | Aimee Hood | 04 | Co Birm'ham | 4:22.11 |
| 8 | 4 | Livia Kingsland | 05 | Nova Cent'n | 4:25.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | Ella Dyson | 04 | Wycombe Dist | 4:22.74 |
| 2 | 11 | Lauren Wetherell | 02 | Ellesmere Co | 4:18.36 |
| 3 | 15 | Michaella Glenister | 02 | UniOfStirl | 4:15.30 |
| 4 | 19 | Holly Hibbott | 99 | Bath NC | 4:07.02 |
| 5 | 17 | Mia Slevin | 03 | Derventio | 4:15.12 |
| 6 | 13 | Freya Colbert | 04 | Nova Cent'n | 4:16.58 |
| 7 | 9 | Betsy Wizard | 03 | Northampton | 4:19.82 |
| 8 | 5 | Megan Barnes | 03 | Mt Kelly | 4:24.90 |