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

One-Way flights

30 Jun	Alaska Airlines
23 Jun	Alaska Airlines
21 Jun	Air Canada
25 Jun	Air Canada
15 Jun	Alaska Airlines
08 Jun	Air Canada
09 Jun	Air Canada
05 Jun	Air Canada
06 Jun	Air Canada
26 Jun	Hawaiian Airlines

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

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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Cheapest one-way flights from Seattle to Seoul in June from $569

One-Way flights