| Place | Lane | Name | School | Time | Qual Mark |
| 1 | 4 | Eric Hersey (10) | LA | 39.76 | 00:39.31 |
| 2 | 5 | David Lefebvre (12) | Paly | 43.07 | 00:42.43 |
| 3 | 2 | Chris Nguyen (11) | Wil | 43.16 | 00:45.24 |
| 4 | 3 | Andrew Xiao (12) | Lyn | 44.45 | 00:42.84 |
| 5 | 6 | Daniel Ooi (11) | Lyn | 45.45 | 00:45.01 |
| 6 | 7 | Benson Low (11) | Milp | 52.52 | 00:53.64 |