| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Aurelia MOORE | 12 | Southport | |
| 2 | 3 | Sadie LAMB | 9 | Southport | 4:20.00 |
| 3 | 5 | Bryony JONES | 10 | Southport | 3:38.28 |
| 4 | 4 | Grace AYLWARD | 11 | Southport | 3:47.35 |
| 5 | 2 | Olivia MASZKOWSKA | 11 | Southport | |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Caitlin CORRIGAN | 13 | Southport | 3:27.09 |
| 2 | 9 | Sophie LEA | 13 | Southport | 3:01.33 |
| 3 | 11 | Harriet RAWLINGS | 15 | Southport | 2:53.10 |
| 4 | 10 | Mia ROBINSON | 12 | Southport | 3:01.20 |
| 5 | 8 | Maisie GEARY | 13 | Southport | 3:04.82 |
| 6 | 6 | India DAVEY | 12 | Southport | 3:36.70 |