# 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 (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 | Date |
| World record | Wang Jianjiahe | China | 3:53.97 | Budapest | 4 October 2018 |
| Championship record | Mireia Belmonte | Spain | 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 | Australia | 3:53.92 | WR, CR |

## Results
### Heats

The heats were started at 10:15.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 3 | Ariarne Titmus | Australia | 3:58.58 | Q |
| 2 | 4 | 5 | Leah Smith | United States | 4:00.46 | Q |
| 3 | 5 | 4 | Wang Jianjiahe | China | 4:00.73 | Q |
| 4 | 5 | 6 | Li Bingjie | China | 4:01.82 | Q |
| 5 | 5 | 5 | Anna Egorova | Russia | 4:02.31 | Q |
| 6 | 5 | 3 | Sarah Köhler | Germany | 4:02.79 | Q |
| 7 | 4 | 6 | Erica Musso | Italy | 4:03.37 | Q |
| 8 | 4 | 0 | Valeriya Salamatina | Russia | 4:04.51 | Q |
| 9 | 5 | 7 | Simona Quadarella | Italy | 4:04.94 | |
| 10 | 4 | 2 | Carla Buchanan | Australia | 4:05.00 | |
| 11 | 4 | 1 | Diana Durães | Portugal | 4:05.65 | |
| 12 | 4 | 9 | Haley Anderson | United States | 4:05.89 | |
| 13 | 4 | 8 | Katja Fain | Slovenia | 4:06.05 | |
| 14 | 5 | 2 | Chihiro Igarashi | Japan | 4:06.21 | |
| 15 | 4 | 7 | Mayuko Goto | Japan | 4:06.81 | |
| 16 | 5 | 1 | Marlene Kahler | Austria | 4:06.95 | |
| 17 | 5 | 9 | Reva Foos | Germany | 4:09.55 | |
| 18 | 3 | 6 | Beril Böcekler | Turkey | 4:09.90 | NR |
| 19 | 3 | 3 | Elisbet Gámez Matos | Cuba | 4:09.94 | |
| 20 | 3 | 5 | Hanna Eriksson | Sweden | 4:10.70 | |
| 21 | 3 | 8 | Rachel Tseng | Singapore | 4:11.11 | NR |
| 22 | 5 | 0 | Catalina Corro | Spain | 4:11.40 | |
| 23 | 3 | 4 | Hayley McIntosh | New Zealand | 4:12.50 | |
| 24 | 5 | 8 | Ho Nam Wai | Hong Kong | 4:13.69 | |
| 25 | 3 | 1 | Sabína Kupčová | Slovakia | 4:14.78 | |
| 26 | 3 | 2 | Jessica Cattaneo | Peru | 4:15.61 | |
| 27 | 1 | 5 | Chen Szu-an | Chinese Taipei | 4:16.49 | |
| 28 | 2 | 5 | Kristina Miletić | Croatia | 4:17.93 | |
| 29 | 2 | 4 | Rosalee Santa Ana | Philippines | 4:18.03 | NR |
| 30 | 3 | 7 | Delfina Dini | Argentina | 4:18.20 | |
| 31 | 3 | 0 | Souad Cherouati | Algeria | 4:20.12 | |
| 32 | 2 | 6 | Gabriella Doueihy | Lebanon | 4:26.56 | |
| 33 | 2 | 2 | Michell Ramirez | Honduras | 4:28.23 | NR |
| 34 | 2 | 0 | Nàdia Tudó Cubells | Andorra | 4:32.85 | |
| 35 | 2 | 3 | Daila Ismatul | Guatemala | 4:34.70 | |
| 36 | 2 | 7 | Matalia Kuipers | United States Virgin Islands | 4:35.11 | NR |
| 37 | 1 | 4 | Lorna Doorman | Zimbabwe | 4:39.58 | |
| 38 | 2 | 1 | Tinatin Kevlishvili | Georgia | 4:40.44 | |
| 39 | 1 | 3 | Tiana Rabarijaona | Madagascar | 4:46.08 | |
| 40 | 2 | 9 | Sonja Kapedani | Albania | 4:55.92 | |
| 41 | 2 | 8 | Osisang Chilton | Palau | 4:56.24 | |
| | 3 | 9 | Talita Te Flan | Ivory Coast | | DNS |
| | 4 | 4 | Boglárka Kapás | Hungary | | DNS |

### Final

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