| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* | 
|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 712 | Lieke KLAVER |  NED | 51.31 Q | |
| 2 | 2 | 2 | 508 | Susanne GOGL-WALLI |  AUT | 51.43 Q NR | |
| 3 | 1 | 1 | 624 | Laviai NIELSEN |  GBR | 51.82 Q | |
| 4 | 3 | 2 | 567 | Lada VONDROVÁ |  CZE | 51.94 q | |
| 5 | 1 | 4 | 709 | Femke BOL |  NED | 52.00 Q | |
| 6 | 4 | 2 | 688 | Stacey Ann WILLIAMS |  JAM | 52.16 q | |
| 7 | 1 | 3 | 807 | Talitha DIGGS |  USA | 52.17 Q | .167 | 
| 8 | 2 | 1 | 758 | Andrea MIKLÓS |  ROU | 52.17 Q | .168 | 
| 9 | 2 | 3 | 659 | Sharlene MAWDSLEY |  IRL | 52.23 Q | .229 | 
| 9 | 2 | 3 | 606 | Amandine BROSSIER |  FRA | 52.23 Q | .229 | 
| 9 | 2 | 3 | 723 | Henriette JÆGER |  NOR | 52.23 Q | .229 | 
| 12 | 3 | 1 | 563 | Tereza PETRŽILKOVÁ |  CZE | 52.31 | |
| 13 | 2 | 4 | 813 | Alexis HOLMES |  USA | 52.53 Q | |
| 14 | 4 | 1 | 746 | Cátia AZEVEDO |  POR | 52.92 | |
| 15 | 3 | 4 | 689 | Charokee YOUNG |  JAM | 53.04 | |
| 16 | 5 | 1 | 584 | Eva SANTIDRIÁN |  ESP | 53.07 | |
| 17 | 5 | 2 | 699 | Gunta VAIČULE |  LAT | 53.09 SB | |
| 18 | 4 | 4 | 671 | Ayomide FOLORUNSO |  ITA | 53.15 | |
| 19 | 5 | 4 | 533 | Tiffani MARINHO |  BRA | 53.48 | |
| 20 | 6 | 4 | 755 | Grace CLAXTON |  PUR | 54.62 | |
| 21 | 5 | 3 | 730 | Lauren HOFFMAN |  PHI | 54.66 | |
| 22 | 6 | 2 | 788 | Yanique HAYE-SMITH |  TKS | 54.98 SB | |
| 23 | 6 | 1 | 550 | Shalysa WRAY |  CAY | 55.82 SB | |
| 24 | 6 | 3 | 537 | Tabata VITORINO |  BRA | 57.73 | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second