EVENT 401 Girl Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Grace O'HARA | 10 | Co Leeds | 7:05.20 |
| 4 | 3 | Bethany MONKHOUSE | 13 | Stocksbridge | 6:50.50 |
| 5 | 2 | Holly STEAD | 14 | Stocksbridge | 6:59.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 4 | Mia THOMSON | 10 | Co Leeds | 6:48.90 |
| 1 | 6 | Emilia HARRISON | 10 | Satellite | 6:37.00 |
| 2 | 8 | Caitlin WATSON | 12 | Borocuda T | 6:30.00 |
| 3 | 10 | Emily ENGLAND - HALL | 10 | Co Wakefield | 6:18.80 |
| 4 | 12 | Lily VEEVERS | 11 | Co Leeds | 6:15.76 |
| 5 | 11 | Olivia BYRNE | 10 | Bo Barnsley | 6:18.70 |
| 6 | 9 | Livia STACEY | 11 | Co Leeds | 6:23.00 |
| 7 | 7 | Isla HARRISON | 12 | Harrogate | 6:30.50 |
| 8 | 5 | Pippa MORRISON | 11 | Co Wakefield | 6:45.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 14 | Daisy GLOVER | 11 | Co Leeds | 6:08.90 |
| 1 | 16 | Amaja WATERS | 11 | Harrogate | 6:07.60 |
| 2 | 18 | Ava BRADLEY | 12 | Co Leeds | 6:01.11 |
| 3 | 20 | Johanna MORTON | 12 | Middlesboro | 5:57.00 |
| 4 | 22 | Alex TIGGARDINE | 14 | Bo Barnsley | 5:44.87 |
| 5 | 21 | Layla HOLMES | 13 | Chapeltown | 5:50.00 |
| 6 | 19 | Elyza HYLANDS | 13 | Harrogate | 6:00.20 |
| 7 | 17 | Amelie COTTERILL | 10 | Co Leeds | 6:03.60 |
| 8 | 15 | Erin BENTLEY | 11 | Co Leeds | 6:08.30 |
| 9 | 13 | Isobel SOUTHALL | 14 | Borocuda T | 6:15.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 24 | Gracie DIXON | 15 | Borocuda T | 5:42.50 |
| 1 | 26 | Masha ALEKSANDROV | 14 | Harrogate | 5:37.00 |
| 2 | 29 | Laila WARD | 13 | Co Wakefield | 5:33.30 |
| 3 | 31 | Molly ORR | 13 | Harrogate | 5:28.00 |
| 4 | 33 | Megan EDWARDS | 12 | Satellite | 5:26.40 |
| 5 | 32 | Daniella SIMPSON | 15 | Satellite | 5:27.00 |
| 6 | 30 | Grace FORD | 13 | Bo Barnsley | 5:32.30 |
| 7 | 27 | Alyssa WARREN | 16 | Bo Barnsley | 5:37.00 |
| 8 | 25 | Mia GALL | 12 | Harrogate | 5:38.30 |
| 9 | 23 | Millie NEWSOME | 17 | Bo Barnsley | 5:43.40 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 35 | Poppy PEARSON | 13 | Bo Barnsley | 5:23.40 |
| 1 | 37 | Lucy WIGHTMAN | 15 | Bo Barnsley | 5:11.20 |
| 2 | 39 | Darcey BLACKER | 14 | Co Leeds | 5:10.60 |
| 3 | 41 | Lottie SWAN | 13 | Harrogate | 5:09.20 |
| 4 | 43 | Letian WU | 13 | Trafford Met | 5:07.10 |
| 5 | 42 | Sophie BAKER | 15 | Harrogate | 5:07.30 |
| 6 | 40 | Sally KNIGHT | 13 | Satellite | 5:09.30 |
| 7 | 38 | Elora SHAW | 14 | Harrogate | 5:11.00 |
| 8 | 36 | Tylan FLETCHER | 13 | Co Leeds | 5:21.39 |
| 9 | 34 | Millie HERBERT | 12 | Bo Barnsley | 5:23.60 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 45 | Jessie BOOTH | 14 | Co Wakefield | 5:06.90 |
| 1 | 48 | Purdy ROBERTS | 14 | Bo Barnsley | 5:02.40 |
| 2 | 50 | Eleanor BRIDGMAN | 14 | Co Wakefield | 4:57.50 |
| 3 | 52 | Grace EDWARDS | 14 | Satellite | 4:52.70 |
| 4 | 54 | Evangeline STACEY | 15 | Co Leeds | 4:30.69 |
| 5 | 53 | Lois CHILD | 12 | Harrogate | 4:43.50 |
| 6 | 51 | Freya CARNELL | 15 | Satellite | 4:55.61 |
| 7 | 49 | Anna FENWICK | 14 | Satellite | 4:58.90 |
| 8 | 47 | Eve SMITH | 16 | Middlesboro | 5:04.90 |
| 9 | 44 | Amelia WRIGHT | 12 | Harrogate | 5:07.00 |