EVENT 304 Boy Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Reuben RAGSDALE-MILLER | 13 | Harrogate | 2:14.80 |
| 4 | 4 | Max CLARK | 11 | Co Leeds | 1:45.70 |
| 5 | 3 | George RICKETTS | 9 | Co Leeds | 1:55.00 |
| 6 | 1 | Jacob DYER | 10 | Co Leeds | 2:22.40 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 6 | Oliver BARKER | 9 | Co Leeds | 1:44.90 |
| 1 | 8 | Harry DIXON | 9 | Co Leeds | 1:42.30 |
| 2 | 10 | Rory KING | 13 | Co Leeds | 1:38.95 |
| 3 | 12 | Elliott MAYERS | 11 | Chapeltown | 1:37.10 |
| 4 | 14 | Leo LI | 10 | Co Leeds | 1:34.50 |
| 5 | 13 | Harrison WAKE | 10 | Co Leeds | 1:35.00 |
| 6 | 11 | Joshua MCMILLAN | 11 | Co Leeds | 1:38.30 |
| 7 | 9 | William LANCASHIRE | 12 | Co Leeds | 1:40.00 |
| 8 | 7 | Lucas WELLS | 11 | Co Leeds | 1:44.25 |
| 9 | 5 | Benjamin HANGULA | 11 | Co Wakefield | 1:45.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 16 | Callum FOZARD | 11 | Co Leeds | 1:32.40 |
| 1 | 18 | Jacob NIXON | 11 | Middlesboro | 1:30.10 |
| 2 | 20 | Abdullah MOKHLISSE | 13 | Co Leeds | 1:28.80 |
| 3 | 22 | William BIRCHALL | 11 | Satellite | 1:27.50 |
| 4 | 24 | Sebastian HUNTER | 12 | Co Leeds | 1:26.00 |
| 5 | 23 | Jamie CAVANAGH | 12 | Satellite | 1:27.50 |
| 6 | 21 | Owen TEMPEST | 11 | Co Leeds | 1:27.70 |
| 7 | 19 | Henley WALKER | 13 | Stocksbridge | 1:28.80 |
| 8 | 17 | Archie MURGATROYD | 11 | Borocuda T | 1:32.00 |
| 9 | 15 | Oscar HUSSEY | 10 | Co Leeds | 1:32.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 26 | Marcu GHETU | 14 | Harrogate | 1:24.30 |
| 1 | 28 | Jackson CLARKE | 12 | Co Leeds | 1:19.70 |
| 2 | 30 | Daniel HAWKINS | 13 | Harrogate | 1:18.80 |
| 3 | 32 | Matei STOICESCU | 13 | Co Leeds | 1:17.20 |
| 4 | 34 | Hayden LAM | 12 | Co Leeds | 1:17.10 |
| 5 | 33 | James THOMSON | 13 | Co Leeds | 1:17.14 |
| 6 | 31 | Alfie YOUNG | 13 | Co Leeds | 1:17.50 |
| 7 | 29 | Connor MCCULLEN | 12 | Co Leeds | 1:19.10 |
| 8 | 27 | Finlay CORKER | 14 | Stocksbridge | 1:22.90 |
| 9 | 25 | Zach PIERCY | 12 | Co Leeds | 1:24.40 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 36 | Jasper WELLER | 13 | Satellite | 1:13.30 |
| 1 | 38 | Aiden COLMER | 15 | Middlesboro | 1:12.70 |
| 2 | 40 | Harry SENIOR | 16 | Co Leeds | 1:11.60 |
| 3 | 42 | Thomas BIDGOOD | 13 | Satellite | 1:09.90 |
| 4 | 44 | Bradley WILSON | 17 | Chapeltown | 1:08.65 |
| 5 | 43 | William DALE-WOOD | 13 | Thirsk WH | 1:09.80 |
| 6 | 41 | Jacob BROOMFIELD | 17 | Chapeltown | 1:10.61 |
| 7 | 39 | Luke DYER | 15 | Co Leeds | 1:11.78 |
| 8 | 37 | Alex OLCHOWIK | 13 | Co Leeds | 1:13.00 |
| 9 | 35 | George DENHAM-EVERETT | 15 | Satellite | 1:17.10 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 46 | Filip WILCZYNSKI | 13 | Sedgefield | 1:07.97 |
| 1 | 48 | Jad IDRIS | 16 | Co Leeds | 1:05.70 |
| 2 | 50 | Finn RIPLEY | 15 | Middlesboro | 1:04.12 |
| 3 | 52 | Connor ROBINSON | 20 | Chapeltown | 1:01.70 |
| 4 | 54 | Michael RIPPER | 21 | Loughboro Un | 56.11 |
| 5 | 53 | William GOWLER | 15 | Middlesboro | 1:00.14 |
| 6 | 51 | Benjamin DALE-WOOD | 14 | Thirsk WH | 1:02.50 |
| 7 | 49 | Daniel CLIPSHAM | 16 | Co Wakefield | 1:05.49 |
| 8 | 47 | Oliver SMITH | 14 | Middlesboro | 1:06.20 |
| 9 | 45 | Samuel HILL | 13 | Co Leeds | 1:08.08 |