Swimming at the 2025 SEA Games – Women's 400 metre freestyle

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
Gan Ching Hwee    Singapore   Kamonchanok Kwanmuang    Thailand   Võ Thị Mỹ Tiên    Vietnam
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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.

Schedule

All times are Indochina Standard Time (UTC+07:00)

Date	Time	Event
Thursday, 12 December 2025	9:22	Heats
	19:22	Final

Records

Prior to this competition, the existing world, Asian and Games records were as follows.

World Record	Summer McIntosh  (CAN)	3:54.18	Victoria, Canada	7 June 2025
Asian Record	Li Bingjie  (CHN)	3:58.21	Singapore, Singapore	27 July 2025
Games Record	Nguyễn Thị Ánh Viên  (VIE)	4:08.66	Singapore, Singapore	10 June 2015

Results

Heats

^[1]

Rank	Heat	Lane	Swimmer	Nationality	Time	Notes
1	2	4	Gan Ching Hwee	Singapore	4:20.19	Q
2	2	5	Kamonchanok Kwanmuang	Thailand	4:25.31	Q
3	2	3	Maria Nedelko	Thailand	4:26.23	Q
4	1	4	Võ Thị Mỹ Tiên	Vietnam	4:28.03	Q
4	1	5	Nguyễn Khả Nhi	Vietnam	4:29.86	Q
6	1	3	Izzy Dwifaiva Hefrisyanthi	Indonesia	4:30.80	Q
7	2	2	Kyla Louise Bulaga	Philippines	4:38.93	Q
8	1	6	Tan Rui Nee	Malaysia	4:41.07	Q
9	2	6	Kelly Teo Yao	Malaysia	4:41.75	R
10	1	2	Kaylonie Amphonesuh	Laos	5:10.48	R, NR

Final

^[2]

Rank	Lane	Swimmer	Nationality	Time	Notes
	4	Gan Ching Hwee	Singapore	4:11.88
	5	Kamonchanok Kwanmuang	Thailand	4:13.56
	6	Võ Thị Mỹ Tiên	Vietnam	4:17.39
4	2	Nguyễn Khả Nhi	Vietnam	4:19.89
5	3	Maria Nedelko	Thailand	4:22.74
6	7	Izzy Dwifaiva Hefrisyanthi	Indonesia	4:33.21
7	8	Tan Rui Nee	Malaysia	4:34.26
8	1	Kyla Louise Bulaga	Philippines	4:38.96

References

1. "Swimming - Women's 400m Freestyle Heats". 33rd SEA Games 2025. Retrieved 18 December 2025.
2. "Swimming - Women's 400m Freestyle Final". 33rd SEA Games 2025. Retrieved 18 December 2025.