Final
dimanche 22 juillet 2018, 16h39 GMT – 16h39 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Kendra Harrison | United States | 12.36″ |
| 2 |  Brianna McNeal | United States | + 0.11″ |
| 3 | Sharika Nelvis | United States | + 0.15″ |
| 4 | Danielle Williams | Jamaica | + 0.19″ |
| 5 | Christina Manning | United States | + 0.21″ |
| 6 | Queen Claye | United States | + 0.27″ |
| 7 | Tobi Amusan | Nigeria | + 0.32″ |
| 8 | Isabelle Pedersen | Norway | + 0.37″ |
| 9 |  Elvira Herman | Belarus | + 0.42″ |