| 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 |