| Women's 400 metre freestyle at the 2025 SEA Games | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Venue | SAT Swimming Pool | |||||||||
| Date | 12 December | |||||||||
| Competitors | 10 from 7 nations | |||||||||
| Winning time | 4:11.88 | |||||||||
| Medalists | ||||||||||
| ||||||||||
The Women's 400 metre freestyle event at the 2025 SEA Games took place on 12 December 2025 at the SAT Swimming Pool in Bangkok, Thailand.
All times are Indochina Standard Time (UTC+07:00)
| Date | Time | Event |
|---|---|---|
| Thursday, 12 December 2025 | 9:22 | Heats |
| 19:22 | Final |
Prior to this competition, the existing world, Asian and Games records were as follows.
| World Record | 3:54.18 | Victoria, Canada | 7 June 2025 | |
| Asian Record | 3:58.21 | Singapore, Singapore | 27 July 2025 | |
| Games Record | 4:08.66 | Singapore, Singapore | 10 June 2015 |
| Rank | Heat | Lane | Swimmer | Nationality | Time | Notes |
|---|---|---|---|---|---|---|
| 1 | 2 | 4 | Gan Ching Hwee | 4:20.19 | Q | |
| 2 | 2 | 5 | Kamonchanok Kwanmuang | 4:25.31 | Q | |
| 3 | 2 | 3 | Maria Nedelko | 4:26.23 | Q | |
| 4 | 1 | 4 | Võ Thị Mỹ Tiên | 4:28.03 | Q | |
| 4 | 1 | 5 | Nguyễn Khả Nhi | 4:29.86 | Q | |
| 6 | 1 | 3 | Izzy Dwifaiva Hefrisyanthi | 4:30.80 | Q | |
| 7 | 2 | 2 | Kyla Louise Bulaga | 4:38.93 | Q | |
| 8 | 1 | 6 | Tan Rui Nee | 4:41.07 | Q | |
| 9 | 2 | 6 | Kelly Teo Yao | 4:41.75 | R | |
| 10 | 1 | 2 | Kaylonie Amphonesuh | 5:10.48 | R, NR |
| Rank | Lane | Swimmer | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 4 | Gan Ching Hwee | 4:11.88 | |||
| 5 | Kamonchanok Kwanmuang | 4:13.56 | |||
| 6 | Võ Thị Mỹ Tiên | 4:17.39 | |||
| 4 | 2 | Nguyễn Khả Nhi | 4:19.89 | ||
| 5 | 3 | Maria Nedelko | 4:22.74 | ||
| 6 | 7 | Izzy Dwifaiva Hefrisyanthi | 4:33.21 | ||
| 7 | 8 | Tan Rui Nee | 4:34.26 | ||
| 8 | 1 | Kyla Louise Bulaga | 4:38.96 |