Heat 4
vendredi 3 août 2018, 11h36 GMT – 11h36 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Sarah Sjöström | Sweden | 56.87″ |
| 2 |  Marie Wattel | France | + 1.6″ |
| 3 |  Aliena Schmidtke | Germany | + 2.02″ |
| 4 | Alys Thomas | Great Britain | + 2.06″ |
| 5 | Kinge Zandringa | Netherlands | + 2.13″ |
| 6 | Amina Kajtaz | Bosnia & Herzegovina | + 2.78″ |
| 7 | Emily Large | Great Britain | + 3.14″ |
| 8 | Svenja Stoffel | Switzerland | + 3.59″ |
| 9 | Polina Egorova | Russia | + 4.03″ |
| 10 | Alexandra Schegoleva | Cyprus | + 6.66″ |