2018 FINA World Swimming Championships (25 m) – Women's 400 metre freestyle
The women's 400 metre freestyle competition of the 2018 FINA World Swimming Championships was held on 14 December 2018.Records
Prior to the competition, the existing world and championship records were as follows.
| Name | Nation | Time | Location | Date |
| World record | Wang Jianjiahe | | 3:53.97 | Budapest | 4 October 2018 |
| Championship record | Mireia Belmonte | | 3:55.76 | Doha | 5 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 | , CR |
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 | |
