Heat 3
lundi 30 septembre 2019, 17h20 GMT – 17h20 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Shakima Wimbley | United States | 51.17″ |
| 2 |  Iga Baumgart-Witan | Poland | + 0.17″ |
| 3 |  Laviai Nielsen | Great Britain | + 0.35″ |
| 4 | Tiffani Silva | Brazil | + 0.79″ |
| 5 | Aiyanna Stiverne | Canada | + 0.86″ |
| 6 | Leni Shida | Uganda | + 1.05″ |
| 7 |  Maria Benedicta Chigbolu | Italy | + 1.46″ |
| 8 | Janet Richard | Malta | + 3.16″ |