Heats
dimanche 21 juillet 2019, 03h45 GMT – 03h45 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Sarah Sjöström | Sweden | 56.45″ |
| 2 |  Emma McKeon | Australia | + 0.45″ |
| 3 |  Maggie MacNeil | Canada | + 0.65″ |
| 4 |  Elena Di Liddo | Italy | + 0.73″ |
| 5 | Kelsi Dahlia | United States | + 0.77″ |
| 6 |  Marie Wattel | France | + 0.78″ |
| 7 | Louise Hansson | Sweden | + 1.05″ |
| 8 | Katie McLaughlin | United States | + 1.22″ |
| 9 |  Anna Ntountounaki | Greece | + 1.43″ |
| 9 | Brianna Throssell | Australia | + 1.43″ |
| 11 | Angelina Köhler | Germany | + 1.47″ |
| 12 |  Yufei Zhang | China | + 1.57″ |
| 13 | Svetlana Chimrova | Russia | + 1.65″ |
| 14 |  Rebecca Smith | Canada | + 1.75″ |
| 15 | Ilaria Bianchi | Italy | + 1.81″ |
| 16 | Hiroko Makino | Japan | + 1.88″ |
| 17 | Farida Osman | Egypt | + 1.98″ |
| 18 | Yichun Wang | China | + 2.06″ |
| 19 |  Suzuka Hasegawa | Japan | + 2.26″ |
| 20 |  Béryl Gastaldello | France | + 2.38″ |
| 21 | Ye-Rin Park | Korea | + 2.54″ |
| 22 | Amina Kajtaz | Bosnia & Herzegovina | + 2.63″ |
| 23 |  Erin Gallagher | South Africa | + 2.76″ |
| 24 | Alys Thomas | Great Britain | + 2.8″ |
| 25 | Kimberly Buys | Belgium | + 2.81″ |
| 26 | Liliána Szilágyi | Hungary | + 2.87″ |
| 27 | Paulina Nogaj | Poland | + 3.37″ |
| 28 |  Emilie Beckmann | Denmark | + 3.49″ |
| 29 | Ana Monteiro | Portugal | + 3.92″ |
| 30 | Remedy Rule | Philippines | + 3.97″ |
| 31 | Aksana Dziamidava | Belarus | + 4.06″ |
| 32 | Kin Lok Chan | Hong Kong, China | + 4.19″ |
| 33 | Aleyna Özkan | Turkey | + 4.23″ |
| 34 | Krystal Lara | United States | + 4.34″ |
| 35 |  Ellen Walshe | Ireland | + 4.4″ |
| 36 | Isabella Páez | Venezuela | + 4.82″ |
| 37 | Jingwen Quah | Singapore | + 5.04″ |
| 38 | Carolina Guevara | Mexico | + 5.06″ |
| 39 | Alexis Margett | Bolivia | + 6.14″ |
| 40 | Emily Muteti | Kenya | + 6.43″ |
| 41 | Julimar Ávila | Honduras | + 7.19″ |
| 42 | Celina Marquez | El Salvador | + 7.48″ |
| 43 | Lia Lima | Angola | + 7.95″ |
| 44 | Bisma Khan | Pakistan | + 10.74″ |
| 45 | Robyn Lee | Zimbabwe | + 11.18″ |
| 46 | Katie Rock | Albania | + 11.4″ |
| 47 | Yusra Mardini | Syria | + 12.34″ |
| 48 | Moana Wind | Fiji | + 14.41″ |
| 49 | Aniqah Gaffoor | Sri Lanka | + 16.18″ |
| 50 | Enkhzul Khuagbaatar | Mongolia | + 17.78″ |
| 51 | Avice Meya | Uganda | + 23.24″ |
| 52 | Lucie Kouadio-Patinier | Ivory Coast | + 30.01″ |