Semifinal
mercredi 8 août 2018, 19h10 GMT – 19h19 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Anna Ryzhykova | Ukraine | 54.82″ |
| 2 | Lea Sprunger | Switzerland | + 0.22″ |
| 3 |  Yadisleidis Pedroso | Italy | + 0.31″ |
| 4 | Eilidh Doyle | Great Britain | + 0.34″ |
| 5 | Meghan Beesley | Great Britain | + 0.39″ |
| 6 | Vera Rudakova | Authorised Neutral Athlete | + 0.42″ |
| 7 |  Viktoriya Tkachuk | Ukraine | + 0.55″ |
| 8 | Ayomide Folorunso | Italy | + 0.87″ |
| 9 |  Hanne Claes | Belgium | + 0.93″ |
| 10 | Line Kloster | Norway | + 0.96″ |
| 11 | Amalie Iuel | Norway | + 0.99″ |
| 12 | Robine Schürmann | Switzerland | + 1.07″ |
| 13 | Zuzana Hejnová | Czech Republic | + 1.21″ |
| 14 |  Joanna Linkiewicz | Poland | + 1.24″ |
| 15 | Aurélie Chaboudez | FFA - France Athlétisme | + 1.37″ |
| 16 | Mariya Mykolenko | Ukraine | + 1.53″ |
| 17 |  Yasmin Giger | Switzerland | + 1.99″ |
| 18 |  Sara Slott Petersen | Denmark | + 2.09″ |
| 19 | Sara Gallego | Spain | + 2.43″ |
| 20 | Kirsten McAslan | Great Britain | + 2.51″ |
| 21 | Justien Grillet | Belgium | + 2.58″ |
| 22 | Sanda Belgyan | Romania | + 2.69″ |
| 23 | Justyna Saganiak | Poland | + 2.89″ |
| Margo Van Puyvelde | Belgium | DNS |