AirHint found the following cheapest return flights from Seoul (ICN) to Seattle (SEA) in August 2026 (see full year).

Return flights

28 Aug - 08 Sep	United
28 Aug - 05 Sep	United
24 Aug - 31 Aug	China Airlines
24 Aug - 29 Aug	United
20 Aug - 29 Aug	United
10 Aug - 23 Aug	China Airlines
02 Aug - 09 Aug	China Airlines
17 Aug - 31 Aug	China Airlines
01 Aug - 09 Aug	China Airlines
04 Aug - 11 Aug	China Airlines
11 Aug - 16 Sep	China Airlines
21 Aug - 29 Aug	Singapore Airlines
13 Aug - 18 Aug	Singapore Airlines
28 Aug - 08 Sep	Asiana Airlines	direct
28 Aug - 05 Sep	Asiana Airlines	direct
11 Aug - 16 Sep	Asiana Airlines	direct

Also check the deals for one-way flights from Seoul to Seattle 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 Seoul to Seattle in August from 703€

Return flights