The women's 400 metre freestyle event at the 2024 World Aquatics Swimming Championships (25 m) was held on 10 December 2024 at the Duna Arena in Budapest, Hungary.

Records Prior to the competition, the existing world and championship records were as follows.

The following record was established during the competition: Date Event Name Nationality Time Record 10 December Final Summer McIntosh 3:50.25

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

Final The final was held at 17:32.

Rank Lane Name Nationality Time Notes 4 Summer McIntosh 3:50.25 5 Lani Pallister 3:53.73 OC 7 Mary-Sophie Harvey 3:54.88 4 6 Paige Madden 3:55.12 5 3 Claire Weinstein 3:56.12 6 2 Isabel Gose 3:56.84 NR 7 1 Leah Neale 4:01.45 8 8 Sofia Diakova Neutral Athletes B 4:02.27

References