| Final 18:43 | time | | L | | 1. Rikako Ikee |  Japan | 53.27s | GR | 4 | | 2. Zhu Menghui |  China | 53.56s | | 5 | | 3. Yang Junxuan | China | 54.17s | | 6 | | 4. Tomomi Aoki | Japan | 54.58s | | 3 | | 5. Camille Cheng |  Hong Kong | 55.39s | | 1 | | 6. Ko Mi-so |  South Korea | 56.07s | | 2 | | 7. Jasmine Alkhaldi |  Philippines | 56.29s | | 7 | | 8. Kornkarnjana Sapianchai |  Thailand | 56.85s | | 8 |
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| Venue: GBK Aquatic Center. |
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Heats - Monday 20.08 Morning session 09:33 |
| Ranking | time | | L | H | | 1. Rikako Ikee | Japan | 54.33s | Q | 4 | 4 | | 2. Zhu Menghui | China | 54.67s | Q | 4 | 2 | | 3. Tomomi Aoki | Japan | 55.57s | Q | 5 | 4 | | 4. Yang Junxuan | China | 55.78s | Q | 4 | 3 | | 5. Ko Mi-so | South Korea | 56.35s | Q | 5 | 2 | | 6. Jasmine Alkhaldi | Philippines | 56.38s | Q | 3 | 4 | | 7. Camille Cheng | Hong Kong | 56.47s | Q | 5 | 3 | | 8. Kornkarnjana Sapianchai | Thailand | 56.49s | Q | 6 | 3 | | eliminated in Heats | | 9. Christie Chue |  Singapore | 56.91s | | 3 | 2 | | 10.Ho Nam Wai | Hong Kong | 57.06s | | 6 | 2 | | 11.Cherlyn Yeoh | Singapore | 57.39s | | 6 | 4 | | 12.Patricia Yosita Hapsari |  Indonesia | 57.40s | | 2 | 3 | | 13.Kim Min-ju | South Korea | 57.62s | | 3 | 3 | | 14.Natthanan Junkrajang | Thailand | 57.87s | | 2 | 4 | | 15.Elizaveta Rogozhnikova |  Kyrgyzstan | 58.38s | | 2 | 2 | | 16.Tan Chi Yan |  Macau | 59.62s | | 7 | 4 | | 17.Enkhkhuslen Batbayar |  Mongolia | 1:00.13 | | 7 | 3 | | 18.Gaurika Singh |  Nepal | 1:00.82 | | 7 | 2 | | 19.Long Chi Wai | Macau | 1:02.07 | | 1 | 4 | | 20.Enkhzul Khuyagbaatar | Mongolia | 1:02.19 | | 1 | 2 | | 21.Bisma Khan |  Pakistan | 1:02.85 | | 1 | 3 | | 22.Tisa Shakya | Nepal | 1:03.96 | | 8 | 4 | | 23.Dania Nour |  Palestine | 1:07.11 | | 3 | 1 | | 24.Anmau Ahmed Saleem | Maldives | 1:14.64 | | 4 | 1 | | 25.Imelda Felicyta Ximenes Belo |  East Timor | 1:16.91 | | 5 | 1 | | 26.Aishath Sajna |  Maldives | 1:17.91 | | 8 | 2 | | 27.Anastasiya Tyurina |  Tajikistan | 1:19.50 | | 8 | 3 |
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