Semifinal 1
lundi 24 juillet 2017, 18h24 GMT – 18h24 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Emily Seebohm | Australia | 58.85″ |
| 2 |  Olivia Smoliga | United States | + 0.22″ |
| 3 |  Kathleen Dawson | Great Britain | + 0.97″ |
| 4 | Georgia Davies | Great Britain | + 1.09″ |
| 5 | Holly Barratt | Australia | + 1.1″ |
| 6 | Hilary Caldwell | Canada | + 1.44″ |
| 7 | Yuanhui Fu | China | + 1.54″ |
| 8 |  Mathilde Cini | France | + 1.59″ |