Semifinal
vendredi 3 août 2018, 18h32 GMT – 18h32 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Sarah Sjöström | Sweden | 56.66″ |
| 2 |  Svetlana Chimrova | Russia | + 0.88″ |
| 3 |  Ilaria Bianchi | Italy | + 1.13″ |
| 4 | Elena Di Liddo | Italy | + 1.16″ |
| 5 | Louise Hansson | Sweden | + 1.33″ |
| 6 |  Anna Ntountounaki | Greece | + 1.68″ |
| 7 |  Emilie Beckmann | Denmark | + 1.74″ |
| 8 | Aliena Schmidtke | Germany | + 1.76″ |
| 9 | Alys Thomas | Great Britain | + 1.78″ |
| 10 |  Marie Wattel | France | + 1.86″ |
| 11 | Liliána Szilágyi | Hungary | + 1.87″ |
| 12 | Kinge Zandringa | Netherlands | + 1.98″ |
| 13 | Kimberly Buys | Belgium | + 2.33″ |
| 14 | Charlotte Atkinson | Great Britain | + 2.7″ |
| 15 | Ana Monteiro | Portugal | + 2.78″ |
| 16 | Amina Kajtaz | Bosnia & Herzegovina | + 2.88″ |