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

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

POS Rank Heat BIB ATHLETE COUNTRY RESULTS
1 1 1 1615 Salwa Eid NASER BRNBRN 49.08 Q SB
2 1 2 1734 Marileidy PAULINO DOMDOM 49.21 Q
3 1 3 2248 Natalia KACZMAREK POLPOL 49.45 Q
4 2 3 1862 Amber ANNING GBRGBR 49.47 Q PB
5 3 3 1566 Sada WILLIAMS BARBAR 49.89 q
6 2 1 1985 Rhasidat ADELEKE IRLIRL 49.95 Q
7 2 2 2440 Alexis HOLMES USAUSA 50.00 Q
8 3 1 2217 Henriette JÆGER NORNOR 50.17 q
9 4 3 2430 Kendall ELLIS USAUSA 50.40
10 4 1 2175 Lieke KLAVER NEDNED 50.44
11 5 3 1705 Roxana GÓMEZ CUBCUB 50.48
12 3 2 1884 Laviai NIELSEN GBRGBR 50.69
13 6 3 2159 Paola MORÁN MEXMEX 50.73
14 4 2 2064 Nickisha PRYCE JAMJAM 50.77
15 5 2 2299 Andrea MIKLÓS ROUROU 50.78
16 7 3 2077 Stacey Ann WILLIAMS JAMJAM 50.79
17 6 2 2209 Ella ONOJUVWEVWO NGRNGR 51.05
18 5 1 1887 Victoria OHURUOGU GBRGBR 51.14
19 7 2 1553 Susanne GOGL-WALLI AUTAUT 51.17
20 6 1 2422 Aaliyah BUTLER USAUSA 51.18
21 7 1 2292 Gabby SCOTT PURPUR 51.22
22 8 2 1718 Lurdes Gloria MANUEL CZECZE 51.42
23 8 3 2304 Miranda Charlene COETZEE RSARSA 51.60
24 8 1 2046 Junelle BROMFIELD JAMJAM 51.93