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

Return flights

26 Oct - 02 Nov	WestJet
21 Oct - 28 Oct	Air Canada
22 Oct - 05 Nov	Air Canada
23 Oct - 10 Nov	Air Canada
24 Oct - 09 Nov	WestJet
24 Oct - 06 Nov	WestJet
20 Oct - 27 Oct	Air Canada
25 Oct - 01 Nov	Alaska Airlines
24 Oct - 11 Nov	Air Canada
01 Oct - 06 Oct	Air Canada
01 Oct - 09 Oct	Air Canada
01 Oct - 16 Oct	Air Canada
02 Oct - 09 Oct	Air Canada
24 Oct - 27 Oct	WestJet
02 Oct - 18 Oct	Air Canada
03 Oct - 13 Oct	Air Canada
03 Oct - 08 Oct	Air Canada
25 Oct - 01 Nov	Asiana Airlines	direct
31 Oct - 09 Nov	Delta	direct
26 Oct - 02 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 605€

Return flights