AirHint found the following cheapest return flights from Seattle (SEA) to Ho Chi Minh City (SGN) in August 2025 (see full year).

Return flights

13 Aug - 17 Sep	Asiana Airlines
13 Aug - 16 Sep	Asiana Airlines
13 Aug - 07 Sep	Asiana Airlines
24 Aug - 25 Sep	Asiana Airlines
24 Aug - 30 Aug	Asiana Airlines
24 Aug - 31 Aug	Asiana Airlines
12 Aug - 17 Sep	STARLUX Airlines
24 Aug - 01 Sep	Asiana Airlines
03 Aug - 18 Aug	ANA
02 Aug - 18 Aug	ANA
03 Aug - 10 Aug	ANA

Also check the deals for one-way flights from Seattle to Ho Chi Minh City in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seattle to Ho Chi Minh City in August from $646

Return flights