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

Return flights

25 Aug - 08 Sep	United
24 Aug - 31 Aug	United
24 Aug - 29 Aug	United
15 Aug - 22 Aug	United
14 Aug - 21 Aug	United
08 Aug - 15 Aug	United
09 Aug - 29 Aug	United
11 Aug - 18 Aug	United
21 Aug - 29 Aug	Singapore Airlines
21 Aug - 25 Aug	Delta
24 Aug - 31 Aug	Korean Air	direct
25 Aug - 08 Sep	Korean Air	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 $690

Return flights