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

Return flights

09 Jul - 16 Jul	Air Canada
31 Jul - 17 Aug	Air Canada
30 Jul - 07 Aug	Air Canada
11 Jul - 14 Jul	Air Canada
07 Jul - 08 Aug	Air Canada
08 Jul - 08 Aug	Air Canada
28 Jul - 01 Aug	Air Canada
14 Jul - 21 Jul	Alaska Airlines
07 Jul - 11 Jul	Air Canada
18 Jul - 31 Jul	WestJet
23 Jul - 30 Jul	Air Canada
22 Jul - 30 Jul	Air Canada
30 Jul - 07 Aug	Asiana Airlines	direct
27 Jul - 20 Aug	Air Canada
30 Jul - 06 Aug	Air Canada
22 Jul - 30 Jul	Asiana Airlines	direct
18 Jul - 31 Jul	Asiana Airlines	direct
28 Jul - 01 Aug	Asiana Airlines	direct
08 Jul - 08 Aug	Asiana Airlines	direct
14 Jul - 21 Jul	Korean Air	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 $957

Return flights