First 1 in each heat (Q) and the next 2 fastest (q)

First in each Repechage heat (Q) and next 2 fastest (q) advance to Semi-Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 4 2430 Kendall ELLIS USAUSA 50.44 Q
2 1 2 2292 Gabby SCOTT PURPUR 50.52 Q NR
3 1 1 2209 Ella ONOJUVWEVWO NGRNGR 50.59 Q .584
4 1 3 1887 Victoria OHURUOGU GBRGBR 50.59 Q SB .585
5 2 2 2304 Miranda Charlene COETZEE RSARSA 50.66 q PB
6 3 2 1718 Lurdes Gloria MANUEL CZECZE 50.81 q
7 2 1 2268 Justyna ŚWIĘTY-ERSETIC POLPOL 50.89 SB
8 2 3 2130 Gunta VAIČULE LATLAT 50.93
9 3 3 2027 Alice MANGIONE ITAITA 51.07 PB
10 3 1 1994 Sharlene MAWDSLEY IRLIRL 51.18
11 2 4 1986 Sophie BECKER IRLIRL 51.28
12 4 2 2140 Modesta Justė MORAUSKAITĖ LTULTU 51.33 SB
13 3 4 1641 Zoe SHERAR CANCAN 51.43
14 5 2 1576 Helena PONETTE BELBEL 51.46 PB .451
15 4 1 1720 Tereza PETRŽILKOVÁ CZECZE 51.46 SB .452
16 4 3 1511 Ellie BEER AUSAUS 51.65
17 6 2 1653 Martina WEIL CHICHI 51.79
18 5 1 1963 Aliyah ABRAMS GUYGUY 51.84
19 4 4 1691 Lina Esther LICONA TORRES COLCOL 51.90
20 5 3 2280 Cátia AZEVEDO PORPOR 52.04 SB
21 5 4 1725 Lada VONDROVÁ CZECZE 52.15
22 6 4 1602 Tiffani MARINHO BRABRA 52.32
23 6 1 1977 Pahal KIRAN INDIND 52.59
24 6 3 1626 Lauren GALE CANCAN 52.68
25 7 3 1688 Evelis AGUILAR COLCOL 52.86 SB
26 7 2 1560 Shaunae MILLER-UIBO BAHBAH 53.50
4 1567 Cynthia BOLINGO BELBEL DNS
Legend

ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second