400m Freestyle / Women
jeudi 9 août 2018 – mardi 14 août 2018
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katie Ledecky | United States | 3′ 58.5″ |
| 2 |  Ariarne Titmus | Australia | + 1.16″ |
| 3 |  Leah Smith | United States | + 5.73″ |
| 4 | Maddy Gough | Australia | + 9.92″ |
| 5 | Emily Overholt | Canada | + 10.31″ |
| 6 |  Waka Kobori | Japan | + 10.54″ |
| 7 | Chihiro Igarashi | Japan | + 13.46″ |
| 8 | Kennedy Goss | Canada | + 14.75″ |
| 9 | Kiah Melverton | Australia | + 9.96″ |
| 10 | Ally McHugh | United States | + 10.58″ |
| 11 | Katie Drabot | United States | + 12.59″ |
| 12 | Mikkayla Sheridan | Australia | + 13.44″ |
| 13 | Ke Zhang | China | + 13.93″ |
| 14 | Mackenzie Padington | Canada | + 15.47″ |
| 15 | Nicole Oliva | Philippines | + 17.82″ |
| 16 | Yukimi Moriyama | Japan | + 20.5″ |
| 17 | Allison Schmitt | United States | + 15.02″ |
| 18 | Erica Sullivan | United States | + 16.18″ |
| 19 | Rosalee Santa Ana | Philippines | + 30.63″ |
| 20 | Gianna Vivien Garcia | Philippines | + 51.94″ |
| 21 | Osisang Chilton | Palau | + 1′ 5.93″ |
| 22 | Mineri Gomez | Guam | + 1′ 15.82″ |