| Final | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Emily Crane | 20 | Loughboro Un | 55.27 |
| 1 | 2 | Emily Barclay | 21 | Loughboro Un | 54.67 |
| 2 | 3 | Siobhan-Marie O'Connor | 23 | Bath Univ | 54.26 |
| 3 | 4 | Anna Hopkin | 22 | Ealing | 52.78 |
| 4 | 5 | Kayla Sanchez | 17 | HPC-Ont CAN | 52.01 |
| 5 | 6 | Marie Wattel | 21 | Loughboro Un | 52.69 |
| 6 | 7 | Peneloppe Oleksiak | 18 | HPC-Ont CAN | 53.87 |
| 7 | 8 | Georgia Coates | 19 | Bath Univ | 54.65 |
| 8 | 9 | Kate Clifton | 18 | Co Sheffield | 54.94 |
| 9 | 10 | Katie Latham | 21 | Thanet Swim | 55.72 |