| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1327 | Chrisann GORDON-POWELL |  JAM | 52.79 Q | 0.189 | 
| 2 | 1599 | Robin Reynolds |  USA | 53.21 Q | 0.155 | 
| 3 | 1454 | Patrycja WYCISZKIEWICZ-ZAWADZKA |  POL | 53.97 | 0.170 | 
| 4 | 1322 | Ylenia Vitale |  ITA | 55.29 PB | 0.182 | 
| 5 | 1503 | Anna Parfenova |  RUS | 55.40 | 0.201 | 
| 6 | 1119 | Kristina Dudek |  CRO | 56.49 | 0.166 | 
| 7 | 1299 | Priyanka Mondal |  IND | 57.16 | 0.182 | 
| 8 | 1225 | Brigitte NTIAMOAH |  FRA | 57.38 | 0.219 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1039 | Shaunae MILLER-UIBO |  BAH | 52.92 Q | 0.368 | 
| 2 | 1585 | Kendall Baisden |  USA | 53.32 Q | 0.171 | 
| 3 | 1477 | Bianca Razor |  ROU | 53.51 q | 0.175 | 
| 4 | 1419 | Florence Uwakwe |  NGR | 54.11 | 0.155 | 
| 5 | 1390 | Modesta JustÄ— MORAUSKAITÄ– |  LTU | 55.55 PB | 0.208 | 
| 6 | 1511 | Anja Benko |  SLO | 55.89 | 0.196 | 
| 7 | 1316 | Raphaela Boaheng LUKUDO |  ITA | 56.46 | 0.170 | 
| 8 | 1290 | Bianka KÉRI |  HUN | 56.97 | 0.223 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1073 | Christian Brennan |  CAN | 53.15 Q | 0.184 | 
| 2 | 1330 | Olivia James |  JAM | 53.51 Q | 0.243 | 
| 3 | 1203 | Ella Räsänen |  FIN | 53.92 q | 0.183 | 
| 4 | 1417 | Rita Ossai |  NGR | 54.02 | 0.184 | 
| 5 | 1573 | Kateryna KARPIUK |  UKR | 56.15 | 0.199 | 
| 6 | 1163 | Barbara CAMBLOR |  ESP | 56.25 | 0.260 | 
| 7 | 1514 | Dorotea Rebernik |  SLO | 57.05 | 0.156 | 
| 8 | 1447 | Blanka Kuta |  POL | 58.35 | 0.158 |