Final
vendredi 4 octobre 2019, 20h30 GMT – 20h30 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Dalilah Muhammad | United States | 52.16″ |
| 2 |  Sydney McLaughlin | United States | + 0.07″ |
| 3 | Rushell Clayton | Jamaica | + 1.58″ |
| 4 | Lea Sprunger | Switzerland | + 1.9″ |
| 5 | Zuzana Hejnová | Czech Republic | + 2.07″ |
| 6 | Ashley Spencer | United States | + 2.29″ |
| 7 | Anna Ryzhykova | Ukraine | + 2.29″ |
| 8 |  Sage Watson | Canada | + 2.66″ |