Heat 4
mardi 7 août 2018, 10h25 GMT – 10h25 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katinka Hosszú | Hungary | 2′ 11.09″ |
| 2 | Zsuzsanna Jakabos | Hungary | + 2.28″ |
| 3 |  Hannah Miley | Great Britain | + 2.51″ |
| 4 | Abbie Wood | Great Britain | + 2.56″ |
| 5 |  Anja Crevar | Serbia | + 3.2″ |
| 6 | Viktoriya Belyakova | Russia | + 3.82″ |
| 7 | Evelyn Verrasztó | Hungary | + 3.95″ |
| 8 | Carlotta Toni | Italy | + 4.82″ |
| 9 |  Kristýna Horská | Czech Republic | + 5.41″ |
| 10 | Niamh Kilgallen | Ireland | + 10.88″ |