| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 3 | 2502 | Stephenie Ann MCPHERSON |
JAM |
49.34 Q PB |
| 2 | 1 | 1 | 1684 | Marileidy PAULINO |
DOM |
49.38 Q NR |
| 3 | 2 | 1 | 2501 | Candice MCLEOD |
JAM |
49.51 Q PB |
| 4 | 1 | 2 | 1131 | Shaunae MILLER-UIBO |
BAH |
49.60 Q |
| 5 | 3 | 1 | 1583 | Roxana GÓMEZ |
CUB |
49.71 q PB |
| 6 | 4 | 1 | 3853 | Quanera HAYES |
USA |
49.81 q |
| 7 | 2 | 3 | 3847 | Allyson FELIX |
USA |
49.89 Q SB |
| 8 | 2 | 2 | 2033 | Jodie WILLIAMS |
GBR |
49.97 Q PB |
| 9 | 3 | 3 | 1151 | Sada WILLIAMS |
BAR |
50.11 NR |
| 10 | 3 | 2 | 2500 | Roneisha MCGREGOR |
JAM |
50.34 |
| 11 | 4 | 2 | 3857 | Wadeline JONATHAS |
USA |
50.51 |
| 12 | 4 | 3 | 3164 | Natalia KACZMAREK |
POL |
50.79 |
| 13 | 5 | 1 | 1606 | Eleni ARTYMATA |
CYP |
50.80 NR |
| 14 | 5 | 2 | 2924 | Paola MORÁN |
MEX |
51.06 SB |
| 15 | 5 | 3 | 1388 | Kyra CONSTANTINE |
CAN |
51.22 |
| 16 | 6 | 3 | 1920 | Amandine BROSSIER |
FRA |
51.30 |
| 17 | 7 | 3 | 3223 | Cátia AZEVEDO |
POR |
51.32 |
| 18 | 6 | 2 | 2995 | Lieke KLAVER |
NED |
51.37 |
| 19 | 7 | 2 | 2249 | Aliyah ABRAMS |
GUY |
51.46 |
| 20 | 6 | 1 | 1112 | Susanne GOGL-WALLI |
AUT |
51.52 PB |
| 21 | 8 | 2 | 1762 | Aauri Lorena BOKESA |
ESP |
51.57 PB |
| 22 | 7 | 1 | 2021 | Ama PIPI |
GBR |
51.59 |
| 23 | 8 | 1 | 1629 | Lada VONDROVÁ |
CZE |
51.62 |
| 24 | 8 | 3 | 2991 | Lisanne DE WITTE |
NED |
52.09 |