The women's 400 metre freestyle competition of the 2018 FINA World Swimming Championships (25 m) was held on 14 December 2018.

Records Prior to the competition, the existing world and championship records were as follows. Name Nation Time Location DateWorld recordWang Jianjiahe3:53.97Budapest4 October 2018Championship recordMireia Belmonte3:55.76Doha5 December 2014

The following new records were set during this competition: Date Event Name Nation Time Record 14 December Final Ariarne Titmus 3:53.92

Results Heats The heats were started at 10:15.

Rank Heat Lane Name Nationality Time Notes 1 4 3 Ariarne Titmus 3:58.58 Q 2 4 5 Leah Smith 4:00.46 Q 3 5 4 Wang Jianjiahe 4:00.73 Q 4 5 6 Li Bingjie 4:01.82 Q 5 5 5 Anna Egorova 4:02.31 Q 6 5 3 Sarah Köhler 4:02.79 Q 7 4 6 Erica Musso 4:03.37 Q 8 4 0 Valeriya Salamatina 4:04.51 Q 9 5 7 Simona Quadarella 4:04.94 10 4 2 Carla Buchanan 4:05.00 11 4 1 Diana Durães 4:05.65 12 4 9 Haley Anderson 4:05.89 13 4 8 Katja Fain 4:06.05 14 5 2 Chihiro Igarashi 4:06.21 15 4 7 Mayuko Goto 4:06.81 16 5 1 Marlene Kahler 4:06.95 17 5 9 Reva Foos 4:09.55 18 3 6 Beril Böcekler 4:09.90 NR 19 3 3 Elisbet Gámez Matos 4:09.94 20 3 5 Hanna Eriksson 4:10.70 21 3 8 Rachel Tseng 4:11.11 NR 22 5 0 Catalina Corro 4:11.40 23 3 4 Hayley McIntosh 4:12.50 24 5 8 Ho Nam Wai 4:13.69 25 3 1 Sabína Kupčová 4:14.78 26 3 2 Jessica Cattaneo 4:15.61 27 1 5 Chen Szu-an 4:16.49 28 2 5 Kristina Miletić 4:17.93 29 2 4 Rosalee Santa Ana 4:18.03 NR 30 3 7 Delfina Dini 4:18.20 31 3 0 Souad Cherouati 4:20.12 32 2 6 Gabriella Doueihy 4:26.56 33 2 2 Michell Ramirez 4:28.23 NR 34 2 0 Nàdia Tudó Cubells 4:32.85 35 2 3 Daila Ismatul 4:34.70 36 2 7 Matalia Kuipers 4:35.11 NR 37 1 4 Lorna Doorman 4:39.58 38 2 1 Tinatin Kevlishvili 4:40.44 39 1 3 Tiana Rabarijaona 4:46.08 40 2 9 Sonja Kapedani 4:55.92 41 2 8 Osisang Chilton 4:56.24 3 9 Talita Te Flan 4 4 Boglárka Kapás

Final The final was held at 19:48. Rank Lane Name Nationality Time Notes 4 Ariarne Titmus 3:53.92 3 Wang Jianjiahe 3:54.56 6 Li Bingjie 3:57.99 4 5 Leah Smith 3:58.58 5 2 Anna Egorova 4:01.52 6 8 Valeriya Salamatina 4:02.87 7 7 Sarah Köhler 4:03.28 8 1 Erica Musso 4:03.61

References