AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (GMP) in August 2025 (see full year).

Return flights

28 Aug - 26 Sep	EVA Air
19 Aug - 23 Aug	EVA Air
18 Aug - 26 Aug	EVA Air
05 Aug - 15 Aug	EVA Air
15 Aug - 22 Aug	EVA Air
01 Aug - 30 Aug	EVA Air
19 Aug - 26 Aug	ANA
14 Aug - 24 Aug	ANA
28 Aug - 25 Sep	ANA
05 Aug - 24 Sep	ANA
04 Aug - 15 Aug	EVA Air
12 Aug - 20 Aug	ANA
06 Aug - 15 Aug	EVA Air
17 Aug - 22 Sep	ANA

Also check the deals for one-way flights from Seattle to Seoul 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 Seoul in August from $1021

Return flights