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

One-Way flights

22 Jul	Hawaiian Airlines
15 Jul	Hawaiian Airlines
21 Jul	Hawaiian Airlines
29 Jul	Hawaiian Airlines
23 Jul	Hawaiian Airlines
24 Jul	ANA
27 Jul	Japan Airlines
20 Jul	Air Canada
11 Jul	ANA
26 Jul	Emirates

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

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 July from $557

One-Way flights