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.

The following new records were set during this competition:

Heats
The heats were started at 10:15.

Final
The final was held at 19:48.