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

Return flights

09 Jun - 18 Jun	WestJet
07 Jun - 21 Jun	WestJet
05 Jun - 07 Jul	WestJet
04 Jun - 13 Jun	Alaska Airlines
30 Jun - 15 Jul	Asiana Airlines
07 Jun - 21 Jul	WestJet
15 Jun - 06 Jul	WestJet
18 Jun - 03 Jul	WestJet
29 Jun - 29 Jul	Asiana Airlines
21 Jun - 23 Jun	Delta
18 Jun - 05 Jul	WestJet
23 Jun - 30 Jun	WestJet
21 Jun - 28 Jun	Alaska Airlines
28 Jun - 28 Jul	Alaska Airlines
21 Jun - 18 Jul	Alaska Airlines
19 Jun - 05 Jul	Alaska Airlines
09 Jun - 18 Jun	Asiana Airlines	direct
04 Jun - 13 Jun	Delta	direct
07 Jun - 21 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 866€

Return flights