Semifinal 1
mercredi 26 juillet 2017, 17h51 GMT – 17h51 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Georgia Davies | Great Britain | 27.49″ |
| 2 |  Emily Seebohm | Australia | + 0.02″ |
| 3 | Aliaksandra Herasimenia | Belarus | + 0.05″ |
| 4 | Xueer Wang | China | + 0.11″ |
| 5 | Anastasia Fesikova | Russia | + 0.16″ |
| 6 |  Mimosa Jallow | Finland | + 0.46″ |
| 7 | Alicja Tchórz | Poland | + 0.64″ |
| 7 |  Theodora Drakou | Greece | + 0.64″ |