Heats
jeudi 13 décembre 2018, 03h06 GMT – 03h06 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katinka Hosszú | Hungary | 58.05″ |
| 2 |  Melanie Margalis | United States | + 0.82″ |
| 3 | Runa Imai | Japan | + 0.94″ |
| 4 |  Emily Seebohm | Australia | + 1.06″ |
| 5 | Shiwen Ye | China | + 1.19″ |
| 6 |  Jenna Laukkanen | Finland | + 1.34″ |
| 7 |  Rika Omoto | Japan | + 1.43″ |
| 8 | Kathleen Baker | United States | + 1.47″ |
| 9 | Alia Atkinson | Jamaica | + 1.64″ |
| 10 |  Ilaria Cusinato | Italy | + 1.71″ |
| 11 | Mariya Kameneva | Russia | + 1.73″ |
| 12 | Lena Kreundl | Austria | + 1.89″ |
| 13 | Ruta Meilutyte | Lithuania | + 2.06″ |
| 14 | Lidón Muñoz | Spain | + 2.66″ |
| 15 | Susann Bjørnsen | Norway | + 2.77″ |
| 16 | Chang Yang | China | + 3.19″ |
| 17 |  Marie Pietruschka | Germany | + 3.29″ |
| 18 | Anastasiya Sorokina | Russia | + 3.42″ |
| 19 | Natalie Kan | Hong Kong, China | + 3.44″ |
| 20 |  Kristýna Horská | Czech Republic | + 3.55″ |
| 21 | Viktoria Günes | Turkey | + 3.61″ |
| 22 | Diana Petkova | Bulgaria | + 3.7″ |
| 23 | Jessica Vall | Spain | + 3.74″ |
| 24 | Neža Klancar | Slovenia | + 3.82″ |
| 25 |  Rebecca Meder | South Africa | + 3.88″ |
| 26 | Ieva Maluka | Latvia | + 3.89″ |
| 27 | Raquel Pereira | Portugal | + 4.02″ |
| 28 | Seraina Sturzenegger | Switzerland | + 4.05″ |
| 29 | Andrea Podmaníková | Slovakia | + 4.72″ |
| 30 | Margaret Markvardt | Estonia | + 4.94″ |
| 31 | Julia Sebastian | Argentina | + 5.11″ |
| 32 | Georgina Mccarthy | New Zealand | + 6.45″ |
| 33 | Nicole Rautemberg | Paraguay | + 6.99″ |
| 34 | Sara Pastrana | Honduras | + 9.91″ |
| 35 | Nooran Ba Matraf | Yemen | + 10.48″ |
| 36 | Latroya Pina | Cape Verde | + 11.94″ |
| 37 | Avice Meya | Uganda | + 15.46″ |
| 38 | Alex Maclaren | Turks and Caicos Islands | + 21.78″ |
| 39 | Sausan Aishath | Maldives | + 21.86″ |