EVENT 402 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 2 | Phoebe DILWORTH | 13 | RichmondDale | 5:07.18 |
| 1 | 4 | M AZANA-BALL | 13 | Co Leeds | 4:55.90 |
| 2 | 6 | Harper ASPINALL | 12 | Wirral Metro | 4:55.70 |
| 3 | 8 | Ava HALLIWELL | 13 | Wirral Metro | 4:55.40 |
| 4 | 10 | Lily CATTLIN | 14 | Rotherham Mo | 4:55.17 |
| 5 | 9 | Ivy HERNANDEZ TAYLOR | 15 | Hackney | 4:55.18 |
| 6 | 7 | Mia TRAVIS-JONES | 14 | Co Leeds | 4:55.61 |
| 7 | 5 | Caitlin HULME | 14 | Wigan BEST | 4:55.80 |
| 8 | 3 | Melina-Grace COMERFORD | 14 | Wigan BEST | 5:02.70 |
| 9 | 1 | Zoe BOWMAN | 13 | AJ Newcastle | 5:09.36 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 12 | Millie WALKER | 15 | Co Leeds | 4:53.98 |
| 1 | 14 | Vivien WILKINSON | 13 | Wirral Metro | 4:52.20 |
| 2 | 16 | Alba KNELLER | 13 | RichmondDale | 4:51.16 |
| 3 | 18 | Isla YATES | 17 | York City | 4:50.60 |
| 4 | 20 | Maisie LLOYD | 14 | Wigan BEST | 4:49.66 |
| 5 | 19 | Hermione COAKLEY-HINES | 14 | Wirral Metro | 4:50.00 |
| 6 | 17 | Evie MCWATT | 16 | KingstonHull | 4:50.80 |
| 7 | 15 | Ennea CHISNALL | 15 | Wigan BEST | 4:51.87 |
| 8 | 13 | Liberty FLOUNDERS | 14 | RichmondDale | 4:52.86 |
| 9 | 11 | Olivia KNOX | 13 | Wigan BEST | 4:55.02 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 22 | Ciara CUST | 17 | Conwy | 4:48.70 |
| 1 | 24 | Millie DARRAND | 15 | York City | 4:47.00 |
| 2 | 26 | Lillie HAMILTON | 16 | South Lincs | 4:45.70 |
| 3 | 28 | Payton CHESTERS | 16 | Co Liverpool | 4:44.75 |
| 4 | 30 | Keira JOHNSON | 14 | Wigan BEST | 4:42.82 |
| 5 | 29 | Megan CHU | 17 | KingstonHull | 4:44.20 |
| 6 | 27 | Macy BARKER | 17 | Co Liverpool | 4:44.99 |
| 7 | 25 | Jessica HUBERY | 14 | Donc Dartes | 4:46.03 |
| 8 | 23 | Lauren BERRY | 14 | Wirral Metro | 4:47.90 |
| 9 | 21 | Isabelle HALL | 13 | Co Leeds | 4:48.84 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 33 | Aimee COY | 16 | Co Liverpool | 4:41.60 |
| 1 | 37 | Hannah BRUCE | 15 | South Lincs | 4:40.40 |
| 2 | 41 | Jorja HOWARD | 14 | Wigan BEST | 4:38.51 |
| 3 | 45 | Rhianna FOSTER | 18 | KingstonHull | 4:34.50 |
| 4 | 49 | Kerry HENNIE | 16 | Co Liverpool | 4:25.90 |
| 5 | 47 | Millie THRELFALL | 15 | Co Leeds | 4:31.04 |
| 6 | 43 | Matilda ASHCROFT | 16 | Co Leeds | 4:37.96 |
| 7 | 39 | Mei YUASA | 14 | Co Leeds | 4:38.83 |
| 8 | 35 | Elizabeth LYONS | 16 | Co Liverpool | 4:40.90 |
| 9 | 31 | Annalise MENDOZA | 16 | KingstonHull | 4:42.28 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 34 | Amelia GERRARD | 15 | Co Liverpool | 4:40.90 |
| 1 | 38 | Kate ROBERTS | 15 | Co Liverpool | 4:39.70 |
| 2 | 42 | Ella MCDERMOTT | 16 | Co Leeds | 4:38.47 |
| 3 | 46 | Lauren LILLEY | 16 | Co Leeds | 4:33.84 |
| 4 | 50 | Elizabeth WARNER | 14 | Co Leeds | 4:24.95 |
| 5 | 48 | Sedona REED | 17 | Co Leeds | 4:30.60 |
| 6 | 44 | Erin O'MEARA | 21 | AJ Newcastle | 4:34.80 |
| 7 | 40 | Jessica O'HERLIHY | 18 | South Lincs | 4:38.54 |
| 8 | 36 | Darcey CROSSLEY | 16 | Co Leeds | 4:40.50 |
| 9 | 32 | Isabel HANDLEY | 15 | Co Leeds | 4:41.78 |