EVENT 401 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Jasmine CRAM | 13 | Borocuda T | 8:08.20 |
| 4 | 3 | Elora STORR | 9 | Borocuda T | 7:30.00 |
| 5 | 2 | Felicity WATSON | 11 | Borocuda T | 7:33.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 4 | Grace ROWNTREE | 11 | Borocuda T | 7:20.00 |
| 1 | 6 | Annabeth CHEUNG | 9 | Co Leeds | 7:00.60 |
| 2 | 8 | Darcy PENNINGTON | 10 | Co Leeds | 7:00.00 |
| 3 | 10 | Francesca WILKINSON | 9 | Co Leeds | 7:00.00 |
| 4 | 12 | Helen PLEGA | 10 | Camden Swiss | 6:57.00 |
| 5 | 11 | Marcie GREEF | 11 | Chester Le S | 7:00.00 |
| 6 | 9 | Pixie GRAHAM | 9 | Settle Srays | 7:00.00 |
| 7 | 7 | Sana SINGH | 10 | Camden Swiss | 7:00.10 |
| 8 | 5 | Amelia BANNON | 10 | Camden Swiss | 7:07.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 14 | Niamh SUTCLIFFE | 10 | Co Leeds | 6:54.20 |
| 1 | 16 | Sienna BOUSFIELD-EVANS | 10 | Settle Srays | 6:49.82 |
| 2 | 18 | A STANISZEWSKA-SCONTUS | 11 | Co Leeds | 6:40.00 |
| 3 | 20 | Isabelle DINSDALE | 12 | Chester Le S | 6:34.30 |
| 4 | 22 | G BOUSFIELD-EVANS | 12 | Settle Srays | 6:28.00 |
| 5 | 21 | Sophia TALBOT | 12 | Chester Le S | 6:30.00 |
| 6 | 19 | Scarlett MACARTHY | 11 | Chester Le S | 6:37.00 |
| 7 | 17 | Heidi EGGLESTON | 11 | Borocuda T | 6:49.20 |
| 8 | 15 | Lola MALCOLM | 9 | Co Leeds | 6:50.06 |
| 9 | 13 | Isla MCCARRON | 10 | Chester Le S | 6:55.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 24 | Arina MIHAILOVA | 10 | Co Leeds | 6:27.69 |
| 1 | 26 | Sophia OZERSKY | 11 | Camden Swiss | 6:25.00 |
| 2 | 28 | Eleanora HAYWARD | 10 | Camden Swiss | 6:20.50 |
| 3 | 30 | Stella BOWES | 9 | Co Leeds | 6:19.32 |
| 4 | 32 | Hollie GRADON | 12 | Chester Le S | 6:17.20 |
| 5 | 31 | Gracie HART | 10 | Co Leeds | 6:19.13 |
| 6 | 29 | Matilde OLINS | 11 | Camden Swiss | 6:20.00 |
| 7 | 27 | Lucie SAWH | 10 | Camden Swiss | 6:21.00 |
| 8 | 25 | Olivia HAN | 10 | Co Leeds | 6:25.30 |
| 9 | 23 | Harper ELLIS | 10 | Co Leeds | 6:27.97 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 34 | Jessica MCMAHON | 11 | Chester Le S | 6:14.30 |
| 1 | 36 | Georgina CRAM | 11 | Borocuda T | 6:12.80 |
| 2 | 38 | Lily HOGAN | 10 | Co Leeds | 6:04.63 |
| 3 | 40 | Ellina BAHDANIONAK | 11 | Camden Swiss | 6:00.60 |
| 4 | 42 | Mia LEIGHTON | 12 | Rotherham Mo | 5:52.85 |
| 5 | 41 | Yulia MIGITA | 11 | Camden Swiss | 5:58.00 |
| 6 | 39 | India EDWARDS | 11 | Co Liverpool | 6:01.90 |
| 7 | 37 | Charlize SCHNEIDER | 11 | Co Leeds | 6:07.95 |
| 8 | 35 | Imogen BURFORD | 11 | Chester Le S | 6:13.30 |
| 9 | 33 | Layla WOODHEAD | 14 | Chester Le S | 6:15.00 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 44 | Bella GLENCROSS | 14 | Workington | 5:51.00 |
| 1 | 46 | Daisy GLOVER | 14 | Co Leeds | 5:48.57 |
| 2 | 48 | Sophia Xiu Hui KOK | 11 | Co Leeds | 5:46.89 |
| 3 | 50 | Defne DEGIRMENCI | 12 | Camden Swiss | 5:46.10 |
| 4 | 52 | Elizabeth ROTHWELL | 11 | Co Leeds | 5:43.40 |
| 5 | 51 | Martha NEWMAN | 10 | Co Leeds | 5:44.14 |
| 6 | 49 | Isabella MCCARRON | 14 | Chester Le S | 5:46.30 |
| 7 | 47 | Isla GRIMSHAW | 13 | Workington | 5:48.50 |
| 8 | 45 | Matilda DARK | 10 | Co Leeds | 5:50.51 |
| 9 | 43 | Caitlin WATSON | 15 | Borocuda T | 5:51.00 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 54 | Matilda SHERLEY-PRICE | 10 | Co Leeds | 5:40.88 |
| 1 | 56 | Naomi DAL | 12 | Camden Swiss | 5:38.30 |
| 2 | 58 | Jagoda JAKUBIEC | 12 | Camden Swiss | 5:30.20 |
| 3 | 60 | Nieve STEVENSON | 16 | Chester Le S | 5:25.80 |
| 4 | 62 | Jinglan HUANG | 11 | Camden Swiss | 5:24.90 |
| 5 | 61 | Evie MORAN | 12 | Co Leeds | 5:25.56 |
| 6 | 59 | Erica BANCROFT | 13 | Chester Le S | 5:29.30 |
| 7 | 57 | Nell HARGREAVES | 11 | Co Leeds | 5:36.02 |
| 8 | 55 | Alana RANKIN | 12 | Co Leeds | 5:40.78 |
| 9 | 53 | Keira ENIKEEVA | 11 | Camden Swiss | 5:41.30 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 64 | Allison LIAW | 12 | Camden Swiss | 5:24.40 |
| 1 | 66 | Bailey GRAHAM | 13 | Settle Srays | 5:23.70 |
| 2 | 68 | Lola BURNETT | 14 | Scunthorpe A | 5:16.60 |
| 3 | 70 | Evie COOK | 12 | Co Leeds | 5:15.75 |
| 4 | 72 | Nok Ching CHAN | 13 | Camden Swiss | 5:11.80 |
| 5 | 71 | Annabel GALBRAITH | 15 | Co Leeds | 5:14.75 |
| 6 | 69 | Katie SADLER | 11 | Co Leeds | 5:16.02 |
| 7 | 67 | Amelie SIDHU-BEVAN | 13 | Camden Swiss | 5:19.80 |
| 8 | 65 | Anna GORDIENKO | 11 | Camden Swiss | 5:24.00 |
| 9 | 63 | Matilda KING | 12 | Camden Swiss | 5:24.90 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 74 | Valerie SHMANEVA | 12 | Camden Swiss | 5:04.90 |
| 1 | 76 | Charlotte BARNARD | 15 | Camden Swiss | 5:01.20 |
| 2 | 78 | Rosie BACKHOUSE | 12 | Scunthorpe A | 4:59.60 |
| 3 | 80 | Ella BANKS | 16 | Welshpool | 4:56.90 |
| 4 | 82 | Anya BABOVIC | 13 | Chester Le S | 4:45.40 |
| 5 | 81 | Lily DAVIDSON | 18 | Chester Le S | 4:49.53 |
| 6 | 79 | Keira OSORIO | 17 | Camden Swiss | 4:58.00 |
| 7 | 77 | Jessica COLLEY | 12 | Co Leeds | 5:00.82 |
| 8 | 75 | Evie THORPE | 13 | Co Leeds | 5:04.72 |
| 9 | 73 | Maya HIGGINS | 12 | Scunthorpe A | 5:05.10 |