EVENT 221 Women 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Ellie Barth-Wehrenalp | 13 | Basildon Ph | 19:13.52 |
| 2 | 3 | Mei Hayakawa | 13 | Barnet Copt | 19:10.11 |
| 3 | 5 | Olivia Norley | 13 | RTW Monson | 19:07.04 |
| 4 | 7 | Matilda Smith | 14 | N & D PP SC | 18:57.92 |
| 5 | 6 | Emily Hughes | 14 | Millfield | 18:58.17 |
| 6 | 4 | Daisy-Sian Palmer | 13 | Atlantis | 19:10.07 |
| 7 | 2 | Isabelle Hall | 12 | Co Leeds | 19:10.23 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Janie Finch | 13 | Co Leicester | 18:56.38 |
| 1 | 11 | Rebecca Johnston | 15 | Basingstoke | 18:52.21 |
| 2 | 13 | Esmee Slinn | 14 | Co Leicester | 18:51.44 |
| 3 | 15 | Greta Highfield | 15 | Donc Dartes | 18:50.14 |
| 4 | 17 | Annabelle Cooper | 14 | Wycombe Dist | 18:49.65 |
| 5 | 16 | Sophie Baker | 14 | Teddington | 18:50.02 |
| 6 | 14 | Matilda Hase | 16 | Derby Excel | 18:50.43 |
| 7 | 12 | Molly-Rosanna Young | 15 | N & D PP SC | 18:52.09 |
| 8 | 10 | Amelia Fenner | 13 | Basildon Ph | 18:54.90 |
| 9 | 8 | Summer Smith | 12 | Romford Town | 18:56.91 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Millie Cammock | 14 | N & D PP SC | 18:49.40 |
| 1 | 21 | Jessica Hubery | 13 | Donc Dartes | 18:49.23 |
| 2 | 23 | Annalise Mendoza | 15 | KingstonHull | 18:48.63 |
| 3 | 25 | Jessica Lines | 14 | Co Leicester | 18:48.23 |
| 4 | 27 | Caitlin O'Neill | 16 | Co Coventry | 18:47.38 |
| 5 | 26 | Hattie Lever | 15 | Witney | 18:47.65 |
| 6 | 24 | Lyla Howard | 16 | Team Luton | 18:48.23 |
| 7 | 22 | Philippa Hickman | 15 | Nova Cent'n | 18:48.69 |
| 8 | 20 | Thea Wiseman Lee | 15 | Teddington | 18:49.36 |
| 9 | 18 | Pollyanna Kershaw | 13 | Blackpool Aq | 18:49.59 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Ella-Grace Lawson | 14 | Warrington W | 18:45.19 |
| 1 | 31 | Phoebe Lawton | 13 | Co Coventry | 18:43.54 |
| 2 | 33 | Hannah Sterry | 14 | TigersJersey | 18:42.71 |
| 3 | 35 | Lucie Bannatyne | 16 | Co Leicester | 18:41.16 |
| 4 | 37 | Isabel Handley | 14 | Co Leeds | 18:40.55 |
| 5 | 36 | Olivia Watts | 14 | Warrington W | 18:40.65 |
| 6 | 34 | Darcey Arnold | 13 | Elmbridge | 18:42.57 |
| 7 | 32 | Lauren Dennett | 14 | Io Man | 18:43.40 |
| 8 | 30 | Nadia Olszewska | 13 | Barnet Copt | 18:43.79 |
| 9 | 28 | Gwen Mearns | 15 | N & D PP SC | 18:47.23 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 39 | Tiffany Latham | 15 | Royal Wolv | 18:40.35 |
| 1 | 41 | Breanna Chamberlain | 16 | Mt Kelly | 18:39.97 |
| 2 | 43 | Ellie Lewis | 15 | Orpington OJ | 18:39.03 |
| 3 | 45 | Grace Robinson | 14 | St Felix Sch | 18:34.75 |
| 4 | 47 | Hannah Day | 15 | Portsmouth N | 18:34.11 |
| 5 | 46 | Lola Wheeler | 16 | Wrekin SC | 18:34.55 |
| 6 | 44 | Francesca Hallam-Stott | 16 | Grantham | 18:38.44 |
| 7 | 42 | Charlotte Heyden | 14 | Wycombe Dist | 18:39.41 |
| 8 | 40 | Molly Gould | 16 | N & D PP SC | 18:40.30 |
| 9 | 38 | Cazia Martin | 14 | Co Sheffield | 18:40.51 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 49 | Mei Yuasa | 13 | Co Leeds | 18:33.25 |
| 1 | 51 | Megan Chu | 16 | KingstonHull | 18:30.80 |
| 2 | 53 | Cara Tohill | 16 | Co Salford | 18:29.71 |
| 3 | 55 | Holly Rotchell | 16 | Crawley | 18:25.17 |
| 4 | 57 | Isabella Hoare | 16 | Wyre Forest | 18:20.83 |
| 5 | 56 | Evie Hands | 16 | Nuneaton | 18:20.85 |
| 6 | 54 | Jessica Thomas | 15 | N & D PP SC | 18:26.37 |
| 7 | 52 | Isla Roberts | 15 | Hackney | 18:30.39 |
| 8 | 50 | Jennifer Walker | 15 | Bassetlaw SS | 18:32.68 |
| 9 | 48 | Bianca Stavar Albarral | 14 | Lancing Col | 18:34.04 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 59 | Emily Forwood | 19 | Mt Kelly | 18:16.66 |
| 1 | 61 | Lucy Cadden | 19 | Derby Excel | 18:06.64 |
| 2 | 63 | Louise Ashford | 18 | Maidenhead | 18:05.57 |
| 3 | 65 | Gemma Dilks | 18 | Tiverton | 18:02.70 |
| 4 | 67 | Harriet Oxley | 18 | Repton | 17:47.55 |
| 5 | 66 | Lauren Jones | 18 | Warrington W | 18:01.89 |
| 6 | 64 | Eve Leleux | 20 | Wrekin SC | 18:03.81 |
| 7 | 62 | Merissa Booth | 18 | Wycombe Dist | 18:05.62 |
| 8 | 60 | Almudena Visser Velez | 21 | Exeter City | 18:12.81 |
| 9 | 58 | Niamh Hasselwander | 16 | Epsom Dist | 18:20.02 |