| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1131 | Shaunae MILLER-UIBO |  BAH | 48.36 AR | 0.162 | 
| 2 | 1684 | Marileidy PAULINO |  DOM | 49.20 NR | 0.176 | 
| 3 | 3847 | Allyson FELIX |  USA | 49.46 SB | 0.158 | 
| 4 | 2502 | Stephenie Ann MCPHERSON |  JAM | 49.61 | 0.131 | 
| 5 | 2501 | Candice MCLEOD |  JAM | 49.87 | 0.152 | 
| 6 | 2033 | Jodie WILLIAMS |  GBR | 49.97 =PB | 0.127 | 
| 7 | 3853 | Quanera HAYES |  USA | 50.88 | 0.176 | 
| 1583 | Roxana GÓMEZ |  CUB | DNF | 0.191 |