| Final | 19:47 | time | | gap | L | | 1. |  Australia | 3:30.95 | | | 4 | 1. | | | Mollie O'Callaghan 52.70s, Madison Wilson 52.60s, Meg Harris 53.00s, Shayna Jack 52.65s | | 2. |  Canada | 3:32.15 | | | 3 | 2. | | | Kayla Sanchez 53.45s, Taylor Ruck 52.92s, Maggie Mac Neil 53.27s, Penny Oleksiak 52.51s | | 3. |  United States | 3:32.58 | | | 5 | 3. | | | Torri Huske 52.96s, Erika Brown 53.30s, Kate Douglass 53.61s, Claire Curzan 52.71s | | 4. |  China | 3:35.25 | | | 2 | 4. | | | Zhang Yufei 54.81s, Zhu Menghui 54.47s, Yang Junxuan 52.79s, Cheng Yujie 53.18s | | 5. |  Great Britain | 3:35.43 | | | 6 | 5. | | | Anna Hopkin 53.70s, Abbie Wood 55.03s, Lucy Hope 54.00s, Freya Anderson 52.70s | | 6. |  Brazil | 3:38.10 | | | 1 | 6. | | | Ana Carolina Vieira 54.78s, Stephanie Balduccini 53.97s, Giovanna Diamante 54.09s, Giovana Medeiros 55.26s | | 7. |  Netherlands | 3:38.18 | | | 7 | 7. | | | Marrit Steenbergen 53.41s, Tessa Giele 54.49s, Kim Busch 55.47s, Valerie van Roon 54.81s | | 8. |  Hungary | 3:38.20 | | | 8 | 8. | | | Nikolett Pádár 55.16s, Fanni Gyurinovics 54.15s, Petra Senánszky 54.88s, Dóra Molnár 54.01s |
| 53 Competitors from 11 Nations. | | World Record: Australia 3:29.69 Tokyo, Japan 25 July 2021 | | World Championship Record: Australia 3:30.21 Gwangju, South Korea 21 July 2019 |
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Heats - Saturday, 18th June 11:18 | | Best 8 times advanced to Final. |
| Heat 2 | | time | | gap | L | Rk. | | 1. | Australia | 3:33.74 | Q | | 4 | 1. | | | Madison Wilson 52.99s, Meg Harris 52.98s, Leah Neale 53.85s, Brianna Throssell 53.92s | | 2. | United States | 3:35.23 | Q | | 5 | 2. | | | Kate Douglass 54.19s, Mallory Comerford 53.86s, Erika Brown 53.29s, Natalie Hinds 53.89s | | 3. | Great Britain | 3:36.24 | Q | | 3 | 4. | | | Lucy Hope 55.12s, Anna Hopkin 53.03s, Medi Harris 54.92s, Freya Anderson 53.17s | | 4. | Brazil | 3:38.04 | Q | | 6 | 7. | | | Ana Carolina Vieira 54.65s, Stephanie Balduccini 54.09s, Giovanna Diamante 53.98s, Giovana Medeiros 55.32s | | 5. |  South Korea | 3:42.94 | | | 7 | 9. | | | Jeong So-eun 55.26s, Hur Yeon-kyung 55.87s, Jung Hyun-young 55.89s, Ko Mi-so 55.92s | | 6. |  Israel | 3:43.59 | | | 2 | 10. | | | Anastasia Gorbenko 54.35s, Daria Golovaty 55.59s, Aviv Barzelay 57.46s, Lea Polonsky 56.19s |
| Heat 1 | | time | | gap | L | Rk. | | 1. | Canada | 3:35.34 | Q | | 4 | 3. | | | Kayla Sanchez 53.51s, Taylor Ruck 53.49s, Rebecca Smith 54.29s, Katerine Savard 54.05s | | 2. | China | 3:36.66 | Q | | 3 | 5. | | | Zhu Menghui 54.65s, Ai Yanhan 54.31s, Lao Lihui 54.26s, Cheng Yujie 53.44s | | 3. | Netherlands | 3:37.56 | Q | | 5 | 6. | | | Kim Busch 55.45s, Marrit Steenbergen 52.99s, Tessa Giele 54.43s, Valerie van Roon 54.69s | | 4. | Hungary | 3:39.04 | Q | | 6 | 8. | | | Nikolett Pádár 55.01s, Petra Senánszky 55.26s, Dóra Molnár 54.91s, Fanni Gyurinovics 53.86s | | 5. |  Thailand | 4:00.22 | | | 2 | 11. | | | Jenjira Srisaard 58.96s, Kamonchanok Kwanmuang 1:01.10, Phiangkhwan Pawapotako 1:01.56, Jinjutha Pholjamjumrus 58.60s |
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