Qualification Round
mercredi 8 août 2018, 11h30 GMT – 11h54 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Laviai Nielsen | Great Britain | 51.67″ |
| 2 |  Cynthia Bolingo | Belgium | + 0.02″ |
| 3 |  Maria Benedicta Chigbolu | Italy | + 0.09″ |
| 4 |  Catia Azevedo | Portugal | + 0.17″ |
| 5 |  Floria Guei | FFA - France Athlétisme | + 0.22″ |
| 6 | Gunta Vaicule | Latvia | + 0.31″ |
| 7 | Polina Miller | Authorised Neutral Athlete | + 0.34″ |
| 8 |  Laura Bueno | Spain | + 0.47″ |
| 9 |  Bianca Razor | Romania | + 0.52″ |
| 10 |  Iga Baumgart-Witan | Poland | + 0.56″ |
| 11 | Tamara Salaški | Serbia | + 0.72″ |
| 12 | Camille Laus | Belgium | + 0.73″ |
| 13 | Andrea Miklos | Romania | + 0.73″ |
| 14 | Tetiana Melnyk | Ukraine | + 0.77″ |
| 15 |  Nadine Gonska | Germany | + 0.87″ |
| 16 |  Laura de Witte | Netherlands | + 0.9″ |
| 17 | Matilda Hellqvist | Sweden | + 1.01″ |
| 18 | Modesta Morauskaite | Lithuania | + 1.01″ |
| 19 | Alena Mamina | Authorised Neutral Athlete | + 1.05″ |
| 20 | Alexandra Bezeková | Slovakia | + 1.21″ |
| 21 | Déspina Mourtá | Greece | + 1.29″ |
| 22 |  Alina Lohvynenko | Ukraine | + 1.51″ |
| 23 | Iveta Putalová | Slovakia | + 1.54″ |
| 24 |  Lada Vondrova | Czech Republic | + 1.54″ |
| 25 | Alena Symerská | Czech Republic | + 1.58″ |
| 26 |  Irini Vasiliou | Greece | + 1.7″ |
| 27 | Kseniya Aksyonova | Authorised Neutral Athlete | + 1.7″ |
| 28 | Zdenka Seidlová | Czech Republic | + 1.71″ |
| 29 | Anastasiya Bryzgina | Ukraine | + 1.95″ |
| 30 | Maja Ciric | Serbia | + 1.98″ |
| 31 | Eva Misiunaite | Lithuania | + 2.35″ |
| 32 | Evelin Nádházy | Hungary | + 2.67″ |