Heat 3
dimanche 28 juillet 2019, 03h31 GMT – 03h31 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katinka Hosszú | Hungary | 4′ 35.4″ |
| 2 |  Shiwen Ye | China | + 2.26″ |
| 3 | Emily Overholt | Canada | + 2.5″ |
| 4 | Ally McHugh | United States | + 2.92″ |
| 5 |  Fantine Lesaffre | France | + 3″ |
| 6 |  Brooke Forde | United States | + 4.34″ |
| 7 |  Mireia Belmonte | Spain | + 6.76″ |
| 8 | Victoria Kaminskaya | Portugal | + 7.63″ |
| 9 | Jimena Pérez | Spain | + 12.11″ |
| 10 | Thi Anh Vien Nguyen | Vietnam | + 12.56″ |