Heat 7
jeudi 27 juillet 2017, 09h30 GMT – 09h30 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Pernille Blume | Denmark | 53.13″ |
| 2 |  Emma McKeon | Australia | + 0.34″ |
| 3 | Bronte Campbell | Australia | + 0.43″ |
| 4 |  Federica Pellegrini | Italy | + 0.79″ |
| 5 |  Sandrine Mainville | Canada | + 1.09″ |
| 6 |  Yanhan Ai | China | + 1.41″ |
| 7 |  Maria Ugolkova | Switzerland | + 1.68″ |
| 8 | Anna Kolárová | Czech Republic | + 2.6″ |
| 9 | Yuliya Khitraya | Belarus | + 2.64″ |
| 10 | Rozaliya Nasretdinova | Russia | + 3.21″ |