Heats
vendredi 14 décembre 2018, 02h36 GMT – 02h36 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Etiene Medeiros | Brazil | 26.13″ |
| 2 |  Yuanhui Fu | China | + 0.13″ |
| 3 |  Olivia Smoliga | United States | + 0.28″ |
| 4 |  Maaike de Waard | Netherlands | + 0.35″ |
| 5 | Caroline Pilhatsch | Austria | + 0.38″ |
| 6 | Miyuki Takemura | Japan | + 0.4″ |
| 7 | Georgia Davies | Great Britain | + 0.43″ |
| 7 | Holly Barratt | Australia | + 0.43″ |
| 9 |  Mathilde Cini | France | + 0.44″ |
| 10 |  Simona Kubová | Czech Republic | + 0.45″ |
| 11 |  Mimosa Jallow | Finland | + 0.47″ |
| 12 | Ranomi Kromowidjojo | Netherlands | + 0.5″ |
| 13 | Anastasia Fesikova | Russia | + 0.57″ |
| 14 | Alicja Tchórz | Poland | + 0.61″ |
| 15 | Kathleen Baker | United States | + 0.64″ |
| 16 |  Emily Seebohm | Australia | + 0.68″ |
| 17 | Karolína Hájková | Slovakia | + 1″ |
| 18 | Xiang Liu | China | + 1.08″ |
| 18 | Andrea Berrino | Argentina | + 1.08″ |
| 20 |  Laura Riedemann | Germany | + 1.09″ |
| 21 | Ingrid Wilm | Canada | + 1.12″ |
| 22 | Isabella Arcila | Colombia | + 1.13″ |
| 23 |  Anastasiya Shkurdai | Belarus | + 1.27″ |
| 24 | Emi Moronuki | Japan | + 1.37″ |
| 25 | Hanna Rosvall | Sweden | + 1.41″ |
| 26 |  Stephanie Au | Hong Kong, China | + 1.44″ |
| 27 | Carlotta Zofkova | Italy | + 1.49″ |
| 28 | Seraina Sturzenegger | Switzerland | + 1.51″ |
| 29 | Ekaterina Avramova | Turkey | + 1.68″ |
| 30 | Jeserik Pinto | Venezuela | + 1.86″ |
| 30 | Ingibjörg Jónsdóttir | Iceland | + 1.86″ |
| 32 | Paige Flynn | New Zealand | + 2.07″ |
| 33 | Hiba Fahsi | Morocco | + 3.09″ |
| 34 | Nimia Murúa | Panama | + 4.21″ |
| 35 | Giuliana Dudok | Uruguay | + 4.61″ |
| 36 | Kimberly Ince | Grenada | + 5.25″ |
| 37 | Britheny Joassaint | Haiti | + 5.35″ |
| 38 | Eda Zeqiri | Kosovo | + 5.42″ |
| 39 | Therese Soukup | Seychelles | + 5.84″ |
| 40 | Jannat Bique | Mozambique | + 5.92″ |
| 41 | Annie Hepler | Marshall Islands | + 7.06″ |
| 42 | Naima Akter | Bangladesh | + 7.73″ |
| 42 | Roylin Akiwo | Palau | + 7.73″ |
| 44 | Daniela Costa | Angola | + 7.88″ |
| 45 | Ada Thioune | Senegal | + 8.19″ |
| 46 | Fatema Almahmeed | Bahrain | + 8.22″ |
| 47 | Noelani Day | Tonga | + 8.32″ |
| 48 | Danielle George | Guyana | + 8.61″ |
| 49 | Kayla Temba | Tanzania | + 10.35″ |
| 50 | Ina Gadama | Malawi | + 16.74″ |
| 51 | Kanu Isha | Sierra Leone | + 22.84″ |
| 52 | Ridaalla Ibrahim | Sudan | + 22.93″ |
 Elena Di Liddo | Italy | DNS | |
| Evalyn Tome | Solomon Islands | DQ | |
| Bopha San | Cambodia | DNS | |
| Jenna Laukkanen | Finland | DNS | |
 Katinka Hosszú | Hungary | DNS |