| | Final 21:32 | time | gap | L | pts | _______ Heat F W_F_4x100m | | 1. |  Australia | 3:27.96 | WR | 4 | 1025 | | | | Mollie O'Callaghan 52.08s, Shayna Jack 1:43.77, Meg Harris 2:36.06, Emma Mckeon 3:27.96 | | 2. |  United States | 3:31.93 | +3.97s | 5 | 968 | | | | Gretchen Walsh 54.06s, Abbey Weitzeil 1:46.77, Olivia Smoliga 2:39.65, Kate Douglass 3:31.93 | | 3. |  China | 3:32.40 | AS +4.44s | 2 | 962 | | | | Yujie Cheng 53.39s, Junxuan Yang 1:46.92, Qingfeng Wu 2:39.56, Yufei Zhang 3:32.40 | | 4. |  Great Britain | 3:33.90 | +5.94s | 6 | 942 | | | | Anna Hopkin 53.67s, Lucy Hope 1:47.20, Abbie Wood 2:41.39, Freya Anderson 3:33.90 | | 5. |  Sweden | 3:34.17 | +6.21s | 7 | 938 | | | | Sarah Sjoestroem 52.24s, Michelle Coleman 1:45.35, Sara Junevik 2:40.06, Louise Hansson 3:34.17 | | 6. |  Netherlands | 3:35.41 | +7.45s | 3 | 922 | | | | Kim Busch 55.05s, Sam Van Nunen 1:49.18, Milou Van Wijk 2:43.57, Marrit Steenbergen 3:35.41 | | 7. |  Canada | 3:36.62 | +8.66s | 1 | 907 | | | | Summer Mcintosh 54.99s, Margaret Macneil 1:48.06, Mary-Sophie Harvey 2:42.63, Taylor Ruck 3:36.62 | | 8. |  Japan | 3:38.61 | +10.65s | 8 | 882 | | | | Rikako Ikee 55.09s, Nagisa Ikemoto 1:48.71, Yume Jinno 2:43.97, Rio Shirai 3:38.61 |
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Heats - Sunday, 23rd July 11:03 | | Best 8 times advanced to Final. |
| | Heat 2 13:08 | time | gap | L | pts | _______ | | 1. | Australia | 3:31.52 | | 4 | 974 | 1. | | | Shayna Jack 52.28s, Brianna Throssell 1:46.23, Meg Harris 2:38.78, Madison Wilson 3:31.52 | | 2. | United States | 3:33.34 | +1.82s | 5 | 949 | 2. | | | Torri Huske 53.55s, Olivia Smoliga 1:46.46, Maxine Parker 2:40.80, Abbey Weitzeil 3:33.34 | | 3. | Netherlands | 3:35.50 | +3.98s | 6 | 921 | 3. | | | Kim Busch 54.66s, Milou Van Wijk 1:49.50, Sam Van Nunen 2:43.37, Marrit Steenbergen 3:35.50 | | 4. | Great Britain | 3:35.98 | +4.46s | 3 | 915 | 4. | | | Anna Hopkin 54.10s, Lucy Hope 1:47.89, Abbie Wood 2:42.53, Freya Anderson 3:35.98 | | 5. | Japan | 3:37.71 | +6.19s | 8 | 893 | 8. | | | Rikako Ikee 54.51s, Nagisa Ikemoto 1:48.47, Yume Jinno 2:43.49, Rio Shirai 3:37.71 | | 6. |  France | 3:38.52 | +7.00s | 7 | 883 | 10. | | | Beryl Gastaldello 54.50s, Lison Nowaczyk 1:48.86, Mary-Ambre Moluh 2:43.91, Assia Touati 3:38.52 | | 7. |  Brazil | 3:38.99 | +7.47s | 2 | 877 | 11. | | | Ana Carolina Vieira 54.46s, Stephanie Balduccini 1:48.38, Celine Bispo 2:43.58, Giovanna Tomanik Diamante 3:38.99 | | 8. |  Spain | 3:42.53 | +11.01s | 1 | 836 | 16. | | | Carmen Weiler Sastre 55.58s, Ainhoa Campabadal Amezcua 1:50.56, Africa Zamorano Sanz 2:46.17, Paula Juste Sanchez 3:42.53 | | 9. |  Thailand | 3:56.84 | +25.32s | 0 | 694 | 18. | | | Kamonchanok Kwanmuang 57.70s, Saovanee Boonamphai 1:57.56, Phiangkhwan Pawapotako 2:58.66, Jenjira Srisa - Ard 3:56.84 |
| | Heat 1 13:03 | time | gap | L | pts | _______ | | 1. | China | 3:36.26 | +4.74s | 5 | 911 | 5. | | | Junxuan Yang 54.20s, Yanhan Ai 1:48.29, Menghui Zhu 2:42.85, Qingfeng Wu 3:36.26 | | 2. | Sweden | 3:36.29 | +4.77s | 3 | 911 | 6. | | | Sarah Sjoestroem 52.89s, Michelle Coleman 1:46.09, Sara Junevik 2:41.05, Sofia Aastedt 3:36.29 | | 3. | Canada | 3:36.39 | +4.87s | 4 | 909 | 7. | | | Margaret Macneil 53.77s, Mary-Sophie Harvey 1:47.76, Katerine Savard 2:42.23, Taylor Ruck 3:36.39 | | 4. |  Italy | 3:37.93 | +6.41s | 6 | 890 | 9. | | | Chiara Tarantino 54.95s, Costanza Cocconcelli 1:49.09, Emma Virginia Menicucci 2:43.59, Sofia Morini 3:37.93 | | 5. |  Hong Kong | 3:39.93 | +8.41s | 9 | 866 | 12. | | | Camille Lily Mei Cheng 56.05s, Siobhan Bernadette Haughey 1:48.64, Hoi Lam TAM 2:44.00, Hoi Shun Stephanie Au 3:39.93 | | 6. |  Hungary | 3:40.02 | +8.50s | 2 | 865 | 13. | | | Petra Senanszky 55.10s, Dora Molnar 1:50.51, Lilla Minna Abraham 2:44.89, Nikolett Padar 3:40.02 | | 7. |  Denmark | 3:41.21 | +9.69s | 0 | 851 | 14. | | | Signe BRO 55.39s, Julie Kepp Jensen 1:49.97, Emilie Beckmann 2:45.72, Helena Rosendahl Bach 3:41.21 | | 8. |  Ireland | 3:41.75 | +10.23s | 8 | 845 | 15. | | | Mona Mc Sharry 55.98s, Danielle Hill 1:51.49, Erin Riordan 2:46.99, Victoria Catterson 3:41.75 | | 9. |  South Africa | 3:45.54 | +14.02s | 7 | 803 | 17. | | | Aimee Canny 54.95s, Emma Chelius 1:51.23, Milla Drakopoulos 2:49.08, Trinity Hearne 3:45.54 | | -. |  Singapore | DNS | | 1 | | |
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