# 2024 World Aquatics Swimming Championships (25 m) – Women's 400 metre freestyle

The Women's 400 metre freestyle competition of the 2024 World Aquatics Swimming Championships (25 m) was held on 10 December 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Li Bingjie (CHN) | 3:51.30 | Beijing, China | 27 October 2022 |
| Competition record | Ariarne Titmus (AUS) | 3:53.92 | Hangzhou, China | 14 December 2018 |
The following record was established during the competition:
| Date | Event | Name | Nationality | Time | Record |
| 10 December | Final | Summer McIntosh | Canada | 3:50.25 | WR |

## Results
### Heats

The heats were started at 09:02.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 5 | Summer McIntosh | Canada | 3:57.55 | Q |
| 2 | 5 | 4 | Lani Pallister | Australia | 3:57.97 | Q |
| 3 | 5 | 6 | Claire Weinstein | United States | 3:58.58 | Q |
| 4 | 5 | 2 | Paige Madden | United States | 3:58.83 | Q |
| 5 | 5 | 7 | Isabel Gose | Germany | 3:59.87 | Q |
| 6 | 4 | 4 | Mary-Sophie Harvey | Canada | 4:00.04 | Q |
| 7 | 4 | 6 | Leah Neale | Australia | 4:01.99 | Q |
| 8 | 4 | 2 | Sofia Diakova | Neutral Athletes B | 4:02.03 | Q |
| 9 | 4 | 5 | Maria Fernanda Costa | Brazil | 4:02.52 | |
| 10 | 4 | 3 | Miyu Namba | Japan | 4:02.75 | |
| 11 | 4 | 1 | Ajna Késely | Hungary | 4:03.14 | |
| 12 | 4 | 7 | Helena Rosendahl Bach | Denmark | 4:03.63 | |
| 13 | 5 | 3 | Simona Quadarella | Italy | 4:04.08 | |
| 14 | 3 | 1 | Gan Ching Hwee | Singapore | 4:04.17 | NR |
| 15 | 5 | 1 | Kong Yaqi | China | 4:05.19 | |
| 16 | 4 | 9 | Eve Thomas | New Zealand | 4:06.27 | |
| 17 | 3 | 3 | Boglárka Kapás | Hungary | 4:06.58 | |
| 18 | 3 | 4 | Letícia Romão | Brazil | 4:08.15 | |
| 19 | 4 | 0 | Liang Xiaolan | China | 4:08.46 | |
| 20 | 5 | 9 | Amelie Blocksidge | Great Britain | 4:08.96 | |
| 21 | 5 | 8 | Francisca Martins | Portugal | 4:09.39 | |
| 22 | 5 | 0 | Deniz Ertan | Turkey | 4:10.25 | |
| 23 | 3 | 7 | Iman Avdić | Bosnia and Herzegovina | 4:10.83 | =NR |
| 24 | 3 | 2 | Tiffany Murillo | Colombia | 4:11.00 | |
| 25 | 4 | 8 | Wiktoria Guść | Poland | 4:11.06 | |
| 26 | 3 | 6 | Delfina Dini | Argentina | 4:11.43 | |
| 27 | 3 | 9 | María Yegres | Venezuela | 4:12.34 | |
| 28 | 3 | 8 | Hannah Robertson | South Africa | 4:12.77 | |
| 29 | 2 | 6 | Kyra Rabess | Cayman Islands | 4:14.77 | NR |
| 30 | 2 | 4 | Laura Benková | Slovakia | 4:15.03 | |
| 31 | 3 | 0 | Vala Dís Cicero | Iceland | 4:16.11 | |
| 32 | 2 | 5 | Gilaine Ma | Hong Kong | 4:16.71 | |
| 33 | 3 | 5 | Han Da-kyung | South Korea | 4:20.03 | |
| 34 | 2 | 2 | Sara Jankovikj | North Macedonia | 4:22.11 | |
| 35 | 2 | 7 | Karin Belbeisi | Jordan | 4:24.70 | |
| 36 | 2 | 8 | Jehanara Nabi | Pakistan | 4:26.85 | |
| 37 | 2 | 1 | Michell Ramírez | Honduras | 4:29.31 | |
| 38 | 2 | 3 | Keisy Castro | Costa Rica | 4:29.83 | |
| 39 | 1 | 4 | Hashika Ramachandra | India | 4:30.30 | |
| 40 | 1 | 5 | Riga Shala | Kosovo | 4:44.01 | |
| 41 | 1 | 3 | Adaya Sian Bourne | Sint Maarten | 5:08.74 | |

### Final

The final was held at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Summer McIntosh | Canada | 3:50.25 | WR |
| | 5 | Lani Pallister | Australia | 3:53.73 | OC |
| | 7 | Mary-Sophie Harvey | Canada | 3:54.88 | |
| 4 | 6 | Paige Madden | United States | 3:55.12 | |
| 5 | 3 | Claire Weinstein | United States | 3:56.12 | |
| 6 | 2 | Isabel Gose | Germany | 3:56.84 | NR |
| 7 | 1 | Leah Neale | Australia | 4:01.45 | |
| 8 | 8 | Sofia Diakova | Neutral Athletes B | 4:02.27 | |