Cheapest one-way flights from Seattle to Seoul in September from 321€

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

One-Way flights

15 Sep WestJet
24 Sep Alaska Airlines
29 Sep Alaska Airlines
19 Sep Alaska Airlines
14 Sep WestJet
16 Sep Air Canada
24 Sep Asiana Airlines direct
09 Sep Asiana Airlines direct
16 Sep Asiana Airlines direct
26 Sep Asiana Airlines direct

Also check the deals for return flights from Seattle to Seoul in September.

Skyscanner

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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