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

One-Way flights

22 Oct	Alaska Airlines
21 Oct	Alaska Airlines
01 Oct	Alaska Airlines
23 Oct	Alaska Airlines
20 Oct	Alaska Airlines
31 Oct	Hawaiian Airlines
21 Oct	Asiana Airlines	direct
20 Oct	Asiana Airlines	direct
31 Oct	Asiana Airlines	direct
04 Oct	Asiana Airlines	direct

Also check the deals for return 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 one-way flights from Seattle to Seoul in October from 297€

One-Way flights