Heats
dimanche 23 juillet 2017, 11h03 GMT – 11h03 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katie Ledecky | United States | 3′ 59.06″ |
| 2 |  Leah Smith | United States | + 2.94″ |
| 3 |  Ariarne Titmus | Australia | + 5.2″ |
| 4 |  Bingjie Li | China | + 5.88″ |
| 5 |  Boglárka Kapás | Hungary | + 6.87″ |
| 6 | Yuhan Zhang | China | + 7.15″ |
| 7 | Veronika Andrusenko | Russia | + 7.34″ |
| 8 | Ajna Késely | Hungary | + 7.42″ |
| 9 |  Anja Klinar | Slovenia | + 8.69″ |
| 10 |  Mireia Belmonte | Spain | + 10.49″ |
| 11 |  Mary-Sophie Harvey | Canada | + 10.68″ |
| 12 | Mackenzie Padington | Canada | + 10.82″ |
| 13 | Diana Durães | Portugal | + 11.01″ |
| 14 | Joanna Maranhão | Brazil | + 12″ |
| 15 | Holly Hibbott | Great Britain | + 13.71″ |
| 16 | Leah Neale | Australia | + 14.32″ |
| 17 | Barbora Závadová | Czech Republic | + 14.79″ |
| 18 | Easop Lee | Korea | + 14.88″ |
| 19 | Arina Openysheva | Russia | + 16.39″ |
| 20 | Julia Hassler | Liechtenstein | + 17.99″ |
| 21 | Andreina Pinto | Venezuela | + 18.4″ |
| 22 | Monique Olivier | Luxembourg | + 18.98″ |
| 23 | Marina Hansen | Denmark | + 19.8″ |
| 24 | Nicole Oliva | Philippines | + 20.17″ |
| 25 | Helena Moreno | Costa Rica | + 20.21″ |
| 26 |  Hang Yu Sze | Hong Kong, China | + 21.51″ |
| 27 | Kate Beavon | South Africa | + 21.76″ |
| 28 | Hania Moro | Egypt | + 22.61″ |
| 29 | Ressa Kania Dewi | Indonesia | + 24.99″ |
| 30 | Gabriella Doueihy | Lebanon | + 26.28″ |
| 31 | Talita Te Flan | Ivory Coast | + 27.66″ |
| 32 | Sudthirak Watcharabusaracum | Thailand | + 31.9″ |
| 33 | Daniella Van den Berg | Aruba | + 33.03″ |
| 34 | Hannah Gill | Barbados | + 43.49″ |
| 35 | Ishani Senanayake | Sri Lanka | + 46.42″ |
| 36 | Victoria Chentsova | Northern Mariana Islands | + 48.09″ |
| Thi Anh Vien Nguyen | Vietnam | DNS |