2018 Pan Pacific Swimming Championships – Women's 400 metre freestyle
# 2018 Pan Pacific Swimming Championships – Women's 400 metre freestyle

The women's 400 metre freestyle competition at the 2018 Pan Pacific Swimming Championships took place on August 11 at the Tokyo Tatsumi International Swimming Center. The defending champion was Katie Ledecky of the United States.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:

| World record | Katie Ledecky (USA) | 3:56.46 | Rio de Janeiro, Brazil | 7 August 2016 |
| - | - | - | - | - |
| Pan Pacific Championships record | Katie Ledecky (USA) | 3:58.37 | Gold Coast, Australia | 23 August 2014 |

## Results

All times are in minutes and seconds.

| KEY: | QA | Qualified A Final | QB | Qualified B Final | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Heats

The first round was held on 11 August from 10:00.

Only two swimmers from each country may advance to the A or B final. If a country not qualify any swimmer to the A final, that same country may qualify up to three swimmers to the B final.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | Katie Ledecky | United States | 4:02.57 | QA |
| 2 | Leah Smith | United States | 4:04.91 | QA |
| 3 | Ariarne Titmus | Australia | 4:06.47 | QA |
| 4 | Allyson McHugh | United States | 4:08.72 | QB |
| 5 | Madeleine Gough | Australia | 4:09.09 | QA |
| 6 | Kiah Melverton | Australia | 4:10.07 | QB |
| 7 | Emily Overholt | Canada | 4:10.58 | QA |
| 8 | Waka Kobori | Japan | 4:10.78 | QA |
| 9 | Katie Drabot | United States | 4:11.09 | QB |
| 10 | Kennedy Goss | Canada | 4:13.00 | QA |
| 11 | Chihiro Igarashi | Japan | 4:13.14 | QA |
| 12 | Allison Schmitt | United States | 4:13.52 | |
| 13 | Mikkayla Sheridan | Australia | 4:13.74 | QB |
| 14 | Erica Sullivan | United States | 4:14.68 | |
| 15 | Zhang Ke | China | 4:15.30 | QB |
| 16 | Mackenzie Padington | Canada | 4:16.27 | QB |
| 17 | Yukimi Moriyama | Japan | 4:18.80 | QB |
| 18 | Nicole Oliva | Philippines | 4:21.80 | QB |
| 19 | Rosalee Santa Ana | Philippines | 4:29.13 | |
| 20 | Gianna Garcia | Philippines | 4:50.44 | |
| 21 | Osisang Chilton | Palau | 5:04.43 | |
| 22 | Mineri Gomez | Guam | 5:14.32 | |

### B Final

The B final was held on 11 August from 18:00.

| Rank | Name | Nationality | Time |
| - | - | - | - |
| 9 | Kiah Melverton | Australia | 4:08.46 |
| 10 | Allyson McHugh | United States | 4:09.08 |
| 11 | Katie Drabot | United States | 4:11.09 |
| 12 | Mikkayla Sheridan | Australia | 4:11.94 |
| 13 | Zhang Ke | China | 4:12.43 |
| 14 | Mackenzie Padington | Canada | 4:13.97 |
| 15 | Nicole Oliva | Philippines | 4:16.32 |
| 16 | Yukimi Moriyama | Japan | 4:19.00 |

### A Final

The A final was held on 11 August from 18:00.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| | Katie Ledecky | United States | 3:58.50 | |
| | Ariarne Titmus | Australia | 3:59.66 | OC |
| | Leah Smith | United States | 4:04.23 | |
| 4 | Madeleine Gough | Australia | 4:08.42 | |
| 5 | Emily Overholt | Canada | 4:08.81 | |
| 6 | Waka Kobori | Japan | 4:09.04 | |
| 7 | Chihiro Igarashi | Japan | 4:11.96 | |
| 8 | Kennedy Goss | Canada | 4:13.25 | |
