Cheapest one-way flights from Seattle to Seoul in September from $346

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

One-Way flights

25 Sep WestJet
30 Sep Air Canada
24 Sep Air Canada
15 Sep WestJet
19 Sep Korean Air direct
20 Sep Air Canada
08 Sep Asiana Airlines direct
21 Sep Korean Air direct
26 Sep Korean Air direct
14 Sep Korean Air 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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