EVENT 304 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Jacob WOOD | 9 | Stocksbridge | 1:56.20 |
| 2 | 5 | Yin Ho Adrian CHAN | 10 | Co Leeds | 1:49.95 |
| 3 | 7 | Oscar CALAM | 10 | Co Leeds | 1:46.49 |
| 4 | 9 | Daniel RILEY | 10 | Bo Barnsley | 1:44.80 |
| 5 | 8 | Finn EASINGWOOD | 11 | Co Leeds | 1:45.00 |
| 6 | 6 | Jacob JONES | 11 | Co Leeds | 1:49.10 |
| 7 | 3 | Fraser GALBRAITH | 9 | Co Leeds | 1:51.86 |
| 8 | 1 | Jacob DYER | 11 | Co Leeds | 2:02.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 11 | M BLACKMORE | 10 | Borocuda T | 1:38.20 |
| 1 | 13 | Liam LI | 9 | Co Leeds | 1:37.27 |
| 2 | 15 | Ellis HARGREAVES | 11 | Co Leeds | 1:33.80 |
| 3 | 17 | Tomas BICKERS | 11 | Co Leeds | 1:30.50 |
| 4 | 19 | Hogan LAM | 12 | Co Leeds | 1:29.20 |
| 5 | 18 | George KING | 11 | Co Leeds | 1:30.02 |
| 6 | 16 | Olaf GRUDOWSKI | 12 | Co Leeds | 1:32.10 |
| 7 | 14 | Jack WATERSON | 12 | Middlesboro | 1:37.20 |
| 8 | 12 | Ted WINGFIELD | 9 | Co Leeds | 1:37.80 |
| 9 | 10 | Charlie KERSHAW | 10 | Donc Dartes | 1:39.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 21 | William PROUD | 12 | Middlesboro | 1:27.90 |
| 1 | 23 | Dimosthenis MAGOULAS | 13 | Bo Barnsley | 1:25.60 |
| 2 | 25 | Elliott MAYERS | 12 | Chapeltown | 1:24.60 |
| 3 | 27 | Oliver BARRETT | 12 | Co Leeds | 1:23.40 |
| 4 | 29 | Oliver ATHA | 12 | Co Leeds | 1:22.81 |
| 5 | 28 | Callum FOZARD | 12 | Co Leeds | 1:23.00 |
| 6 | 26 | Jeffrey LANGE | 12 | Co Leeds | 1:23.83 |
| 7 | 24 | Harrison WAKE | 11 | Co Leeds | 1:25.34 |
| 8 | 22 | Noah DARNELL | 12 | Co Leeds | 1:27.50 |
| 9 | 20 | Owen TEMPEST | 12 | Co Leeds | 1:28.08 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 31 | Oscar HUSSEY | 11 | Co Leeds | 1:22.10 |
| 1 | 33 | Leo LI | 11 | Co Leeds | 1:19.23 |
| 2 | 35 | Ethan REDDIVARI | 12 | Middlesboro | 1:13.70 |
| 3 | 37 | Oliver MAYGER | 15 | Thirsk WH | 1:10.90 |
| 4 | 39 | William DALE-WOOD | 14 | Thirsk WH | 1:06.30 |
| 5 | 38 | Luke DYER | 16 | Co Leeds | 1:06.30 |
| 6 | 36 | Reuben HARRISON | 13 | Co Leeds | 1:13.20 |
| 7 | 34 | Benjamin ROUTLEDGE | 13 | New Earswick | 1:17.50 |
| 8 | 32 | Abdullah MOKHLISSE | 14 | Chapeltown | 1:21.40 |
| 9 | 30 | Stan DAWSON | 12 | Borocuda T | 1:22.60 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 41 | Matthew JAMES | 15 | Co Leeds | 1:04.61 |
| 1 | 43 | Callum RAVEN | 15 | Co Leeds | 1:03.68 |
| 2 | 45 | Adam FRAZER | 17 | Rushden | 1:01.70 |
| 3 | 47 | Ryan COLES | 18 | Rushden | 1:01.09 |
| 4 | 49 | Benjamin DALE-WOOD | 15 | Thirsk WH | 59.90 |
| 5 | 48 | Oliver SMITH | 15 | Middlesboro | 1:00.80 |
| 6 | 46 | Tyler COLES | 17 | Rushden | 1:01.10 |
| 7 | 44 | Oliver STEELE | 16 | Co Leeds | 1:02.40 |
| 8 | 42 | Aman THETHY | 15 | Rushden | 1:04.30 |
| 9 | 40 | Tin Ho CHEUNG | 15 | Co Leeds | 1:05.79 |