| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* | 
|---|---|---|---|---|---|---|---|
| 1 | 1 | 5 | 3876 | Dalilah MUHAMMAD |  USA | 53.97 Q | |
| 2 | 1 | 4 | 2987 | Femke BOL |  NED | 54.43 Q | |
| 3 | 1 | 2 | 3757 | Anna RYZHYKOVA |  UKR | 54.56 Q | |
| 4 | 1 | 3 | 3870 | Sydney MCLAUGHLIN-LEVRONE |  USA | 54.65 Q | |
| 5 | 2 | 5 | 2114 | Carolina KRAFZIK |  GER | 54.72 Q PB | |
| 6 | 3 | 5 | 3516 | Lea SPRUNGER |  SUI | 54.74 Q SB | |
| 7 | 1 | 1 | 3766 | Viktoriya TKACHUK |  UKR | 54.80 Q | |
| 8 | 2 | 2 | 2513 | Janieve RUSSELL |  JAM | 54.81 Q | |
| 9 | 3 | 2 | 1176 | Paulien COUCKUYT |  BEL | 54.90 Q NR | |
| 10 | 4 | 5 | 3172 | Joanna LINKIEWICZ |  POL | 54.93 Q PB | |
| 11 | 5 | 5 | 1584 | Zurian HECHAVARRÍA |  CUB | 54.99 q PB | |
| 12 | 6 | 5 | 3538 | Emma ZAPLETALOVÁ |  SVK | 55.00 q | |
| 13 | 2 | 1 | 1536 | Melissa GONZALEZ |  COL | 55.32 Q NR | |
| 14 | 3 | 1 | 3836 | Anna COCKRELL |  USA | 55.37 Q | |
| 15 | 2 | 3 | 3122 | Gianna WOODRUFF |  PAN | 55.49 Q | |
| 16 | 3 | 3 | 1659 | Sara Slott PETERSEN |  DEN | 55.52 Q | |
| 17 | 4 | 2 | 2403 | Linda OLIVIERI |  ITA | 55.54 Q =PB | .532 | 
| 18 | 4 | 1 | 1414 | Sage WATSON |  CAN | 55.54 Q | .535 | 
| 19 | 5 | 1 | 2405 | Yadisleidis PEDROSO |  ITA | 55.57 q SB | |
| 20 | 6 | 1 | 3075 | Amalie IUEL |  NOR | 55.65 q | |
| 21 | 5 | 2 | 1896 | Viivi LEHIKOINEN |  FIN | 55.67 | |
| 22 | 2 | 4 | 1149 | Tia-Adana BELLE |  BAR | 55.69 Q SB | |
| 23 | 4 | 3 | 4015 | Thi Lan QUACH |  VIE | 55.71 Q SB | |
| 24 | 6 | 2 | 1402 | Noelle MONTCALM |  CAN | 55.85 SB | |
| 25 | 7 | 1 | 1347 | Aminat JAMAL |  BRN | 55.90 SB | |
| 26 | 7 | 2 | 1996 | Meghan BEESLEY |  GBR | 55.91 | |
| 27 | 3 | 4 | 3383 | Wenda NEL |  RSA | 56.06 Q | |
| 28 | 8 | 1 | 1175 | Hanne CLAES |  BEL | 56.38 SB | |
| 29 | 7 | 5 | 3076 | Line KLOSTER |  NOR | 56.45 | |
| 30 | 5 | 3 | 2400 | Eleonora MARCHIANDO |  ITA | 56.82 | |
| 31 | 4 | 4 | 2028 | Jessica TURNER |  GBR | 56.83 Q | |
| 32 | 5 | 4 | 1049 | Sarah CARLI |  AUS | 56.93 SB | |
| 33 | 6 | 4 | 3502 | Yasmin GIGER |  SUI | 57.03 | |
| 34 | 8 | 5 | 1005 | Loubna BENHADJA |  ALG | 57.19 PB | |
| 35 | 8 | 2 | 1288 | Chayenne DA SILVA |  BRA | 57.55 | |
| 36 | 6 | 3 | 3751 | Mariya MYKOLENKO |  UKR | 57.86 | |
| 3 | 2009 | Jessie KNIGHT |  GBR | DNF | |||
| 3 | 2508 | Leah NUGENT |  JAM | DQ | |||
| 4 | 2525 | Ronda WHYTE |  JAM | DQ | |||
| 4 | 3619 | Sparkle MCKNIGHT |  TTO | DNS | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second