EVENT 304 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Finley GILL | 9 | Co Leeds | 2:00.00 |
| 3 | 3 | Oskar SZAMUK | 10 | Co Leeds | 1:48.13 |
| 4 | 5 | Reuben BARKER | 9 | Co Leeds | 1:41.87 |
| 5 | 4 | George BEILBY-WOODWARD | 10 | Co Leeds | 1:44.90 |
| 6 | 2 | Gethin GARSIDE | 9 | Cleethorpes | 2:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Theo SIRA | 11 | Co Leeds | 1:37.78 |
| 2 | 9 | Callum YOUNG | 9 | Co Leeds | 1:34.83 |
| 3 | 11 | David GRIGORE | 11 | Co Leeds | 1:30.30 |
| 4 | 13 | Jenson STILLINGS | 13 | Co Sheffield | 1:27.20 |
| 5 | 12 | Max SMITH | 12 | Co Sheffield | 1:27.60 |
| 6 | 10 | Adam MOHAMED | 9 | Co Leeds | 1:33.30 |
| 7 | 8 | Finley SMITH | 9 | Co Leeds | 1:37.00 |
| 8 | 6 | George HALL | 9 | Co Sheffield | 1:40.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Ellis HARGREAVES | 12 | Co Leeds | 1:26.78 |
| 2 | 17 | Liam LI | 10 | Co Leeds | 1:25.40 |
| 3 | 19 | Ted WINGFIELD | 10 | Co Leeds | 1:25.00 |
| 4 | 21 | William FINNIE | 12 | Co Sheffield | 1:21.00 |
| 5 | 20 | Owen TEMPEST | 13 | Co Leeds | 1:23.47 |
| 6 | 18 | Samuel FORD | 10 | Co Leeds | 1:25.20 |
| 7 | 16 | Logan EVANS | 11 | Blackpool Aq | 1:25.60 |
| 8 | 14 | Zac PHILLIPS | 10 | Co Leeds | 1:26.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Hogan LAM | 13 | Co Leeds | 1:18.20 |
| 2 | 25 | Olaf GRUDOWSKI | 13 | Co Leeds | 1:17.51 |
| 3 | 27 | Brodie CHARLESWORTH | 16 | Bo Barnsley | 1:16.50 |
| 4 | 29 | Elliott MAYERS | 13 | Chapeltown | 1:13.20 |
| 5 | 28 | Tyler RAVEN | 11 | Co Leeds | 1:15.70 |
| 6 | 26 | Noah DARNELL | 13 | Co Leeds | 1:16.90 |
| 7 | 24 | Oliver BARRETT | 13 | Co Leeds | 1:17.80 |
| 8 | 22 | Abdullah MOKHLISSE | 15 | Chapeltown | 1:18.60 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Joshua GUY | 14 | Bo Barnsley | 1:10.80 |
| 2 | 33 | Monty MOULTON | 15 | Co Salford | 1:08.60 |
| 3 | 35 | Callum RAVEN | 16 | Co Leeds | 1:03.41 |
| 4 | 37 | Mathew BRADLEY | 18 | Cleethorpes | 1:01.43 |
| 5 | 36 | Matthew JAMES | 16 | Co Leeds | 1:01.80 |
| 6 | 34 | Matei STOICESCU | 14 | Co Leeds | 1:06.56 |
| 7 | 32 | Jackson CLARKE | 14 | Co Leeds | 1:09.39 |
| 8 | 30 | Xiaotian ZHANG | 12 | Cleethorpes | 1:11.00 |