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

Return flights

18 Jul - 03 Aug	Asiana Airlines	direct
21 Jul - 20 Aug	Asiana Airlines	direct
25 Jul - 23 Aug	Asiana Airlines
25 Jul - 24 Aug	Asiana Airlines
26 Jul - 24 Aug	Asiana Airlines
28 Jul - 04 Aug	Asiana Airlines	direct
21 Jul - 28 Jul	Asiana Airlines	direct
22 Jul - 29 Jul	Air Canada
25 Jul - 24 Aug	Korean Air	direct
26 Jul - 24 Aug	Korean Air	direct
25 Jul - 23 Aug	Delta	direct
22 Jul - 29 Jul	Delta	direct
30 Jul - 02 Aug	Delta	direct

Also check the deals for one-way flights from Seattle to Seoul in July.

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 July from 809€

Return flights