EVENT 401 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Sophia LANGE | 9 | Co Leeds | 7:50.00 |
| 2 | 3 | Madeleine FLAHERTY | 10 | Co Leeds | 6:35.19 |
| 3 | 5 | Chloe TAYLOR | 10 | Middlesboro | 6:33.70 |
| 4 | 7 | Alana RANKIN | 10 | Co Leeds | 6:31.60 |
| 5 | 6 | Holly STEAD | 15 | Stocksbridge | 6:32.20 |
| 6 | 4 | Evie COOK | 10 | Co Leeds | 6:35.00 |
| 7 | 2 | Danica LEITAO | 13 | Donc Dartes | 7:00.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Abigail COLLEY | 12 | Co Leeds | 6:30.00 |
| 1 | 11 | Verity LILLEY | 11 | Co Leeds | 6:26.36 |
| 2 | 13 | Lola HAWORTH-BLOMFIELD | 12 | Stocksbridge | 6:14.20 |
| 3 | 15 | Jessica COLLEY | 10 | Co Leeds | 6:09.56 |
| 4 | 17 | Evelyn ATKINSON | 10 | Co Leeds | 5:59.16 |
| 5 | 16 | Ellie ASHTON | 14 | Chapeltown | 6:05.50 |
| 6 | 14 | Madison SIMMONDS | 11 | Donc Dartes | 6:14.10 |
| 7 | 12 | Isabelle PARK | 10 | Co Leeds | 6:22.04 |
| 8 | 10 | Jessica AYRE | 11 | Middlesboro | 6:30.00 |
| 9 | 8 | Martha WADDELL | 11 | Co Leeds | 6:30.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Layla HOLMES | 14 | Chapeltown | 5:57.96 |
| 1 | 21 | Poppy AYRE | 11 | Middlesboro | 5:56.30 |
| 2 | 23 | Gracie-Mae BLAKE | 12 | Middlesboro | 5:46.70 |
| 3 | 25 | Lily VEEVERS | 12 | Co Leeds | 5:39.00 |
| 4 | 27 | Willow WRIGHT | 10 | Co Leeds | 5:36.18 |
| 5 | 26 | Addison CROPPER | 10 | Co Leeds | 5:36.88 |
| 6 | 24 | Grace BALLANTYNE | 13 | New Earswick | 5:45.00 |
| 7 | 22 | Brooke DICKINSON | 13 | Donc Dartes | 5:47.04 |
| 8 | 20 | Isabella STOICESCU | 11 | Co Leeds | 5:57.14 |
| 9 | 18 | Neve STAFFORD | 10 | Co Leeds | 5:58.45 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Jessica LEWIS | 14 | Thirsk WH | 5:27.70 |
| 1 | 31 | Johanna MORTON | 13 | Middlesboro | 5:23.30 |
| 2 | 33 | Ava CONNELL | 14 | Co Leeds | 5:20.00 |
| 3 | 35 | Sophia YU | 14 | Stretford | 5:12.20 |
| 4 | 37 | Ruby ELLIS | 15 | Co Leeds | 5:09.60 |
| 5 | 36 | Millie HERBERT | 13 | Bo Barnsley | 5:12.20 |
| 6 | 34 | Tylan FLETCHER | 14 | Co Leeds | 5:14.39 |
| 7 | 32 | Ursula CARROLL | 11 | Stocksbridge | 5:22.30 |
| 8 | 30 | Lucy SUMMERS | 18 | Thirsk WH | 5:24.40 |
| 9 | 28 | Philippa RANKIN | 12 | Leyland Barr | 5:30.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 39 | Lucy WIGHTMAN | 16 | Bo Barnsley | 5:09.40 |
| 1 | 41 | Robyn HOWARD | 13 | Co Leeds | 5:04.41 |
| 2 | 43 | Emily MARRISON | 13 | Co Leeds | 5:00.50 |
| 3 | 45 | Katie PINK | 16 | Middlesboro | 4:47.50 |
| 4 | 47 | Pearl LIGHTWOOD | 17 | Middlesboro | 4:44.90 |
| 5 | 46 | Ella MCDERMOTT | 15 | Co Leeds | 4:46.80 |
| 6 | 44 | Ella PROUD | 16 | Middlesboro | 4:58.00 |
| 7 | 42 | Mae HODGSON | 16 | Thirsk WH | 5:01.70 |
| 8 | 40 | Imogen HOLBROOK | 21 | York City | 5:05.40 |
| 9 | 38 | Millie MAYGER | 18 | Thirsk WH | 5:09.40 |