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

Return flights

01 Oct - 08 Oct	Air Canada
29 Oct - 05 Nov	Air Canada
04 Oct - 19 Oct	Air Canada
03 Oct - 10 Oct	Air Canada
02 Oct - 18 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
12 Oct - 19 Oct	Air Canada
07 Oct - 28 Oct	Asiana Airlines
07 Oct - 28 Oct	Asiana Airlines	direct
03 Oct - 10 Oct	Asiana Airlines	direct
01 Oct - 08 Oct	Asiana Airlines	direct
29 Oct - 05 Nov	Asiana Airlines	direct
08 Oct - 05 Nov	Delta	direct

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

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 October from $798

Return flights