The Women's 400-metre freestyle competition at the 2019 World Championships was held on 21 July 2019. Ariarne Titmus overcame a 0.62-second deficit in the last 50 metres to defeat defending champion

Katie Ledecky Kathleen Genevieve Ledecky (born March 17, 1997) is an American competitive swimmer. She has won seven Olympic gold medals and 19 world championship gold medals, the most in history for a female swimmer. Ledecky's six individual gold medals at ...

. This was Ledecky's first loss in a major international 400 metre freestyle competition.

Records

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

Results

Heats

The heats were held at 11:22.

Final

The final was held at 20:33.Final results
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References

{{DEFAULTSORT:2019 World Aquatics Championships - Women's 400 metre freestyle Women's 400 metre freestyle 2019 in women's swimming