| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 273 | Stephenie Ann MCPHERSON |
JAM |
51.26 Q SB |
| 2 | 2 | 1 | 300 | Femke BOL |
NED |
51.28 Q |
| 3 | 1 | 2 | 110 | Shaunae MILLER-UIBO |
BAH |
51.38 Q SB |
| 4 | 3 | 1 | 233 | Aliyah ABRAMS |
GUY |
51.57 Q AIR |
| 5 | 2 | 2 | 323 | Justyna ŚWIĘTY-ERSETIC |
POL |
51.67 Q |
| 6 | 3 | 2 | 303 | Lieke KLAVER |
NED |
51.81 Q |
| 7 | 4 | 1 | 319 | Natalia KACZMAREK |
POL |
51.87 |
| 8 | 4 | 2 | 208 | Jessie KNIGHT |
GBR |
51.93 SB |
| 9 | 5 | 2 | 291 | Modesta JustÄ— MORAUSKAITÄ– |
LTU |
52.00 |
| 10 | 5 | 1 | 150 | Roxana GÓMEZ |
CUB |
52.28 |
| 11 | 6 | 2 | 245 | Phil HEALY |
IRL |
52.40 |
| 12 | 6 | 1 | 215 | Ama PIPI |
GBR |
52.95 |