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

Return flights

01 Oct - 14 Oct	Air Canada
02 Oct - 11 Oct	Air Canada
01 Oct - 19 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
13 Oct - 19 Oct	China Airlines
19 Oct - 09 Nov	WestJet
17 Oct - 26 Oct	WestJet
15 Oct - 09 Nov	China Airlines
18 Oct - 12 Nov	Air Canada
18 Oct - 26 Oct	Air Canada
04 Oct - 19 Oct	Alaska Airlines
13 Oct - 31 Oct	Hawaiian Airlines
02 Oct - 06 Oct	Air Canada
31 Oct - 11 Nov	Asiana Airlines
18 Oct - 12 Nov	Asiana Airlines	direct
19 Oct - 09 Nov	Delta	direct
26 Oct - 16 Nov	Delta	direct
01 Oct - 05 Nov	Delta	direct
08 Oct - 05 Nov	Delta	direct
31 Oct - 11 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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Seattle to Seoul in October from 709€

Return flights