AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (ICN) in June 2026 (see full year).

Return flights

08 Jun - 25 Jun	Asiana Airlines	direct
20 Jun - 04 Jul	Asiana Airlines	direct
15 Jun - 10 Jul	Asiana Airlines	direct
16 Jun - 10 Jul	Asiana Airlines	direct
22 Jun - 02 Jul	Asiana Airlines	direct
27 Jun - 11 Jul	Asiana Airlines	direct
21 Jun - 28 Jun	Delta	direct
23 Jun - 30 Jun	Delta	direct

Also check the deals for one-way 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 return flights from Seattle to Seoul in June from 781€

Return flights