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

Return flights

22 Jul - 25 Jul	Alaska Airlines
16 Jul - 28 Jul	ANA
12 Jul - 25 Aug	ANA
22 Jul - 20 Aug	Japan Airlines
23 Jul - 31 Jul	Japan Airlines
08 Jul - 17 Jul	Japan Airlines
16 Jul - 27 Jul	Japan Airlines
14 Jul - 18 Jul	ANA
10 Jul - 17 Jul	Japan Airlines
16 Jul - 29 Jul	Japan Airlines
11 Jul - 18 Jul	ANA
31 Jul - 17 Aug	ANA
20 Jul - 02 Aug	Hawaiian Airlines
20 Jul - 22 Jul	ANA

Also check the deals for one-way 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 return flights from Seattle to Seoul in July from $1329

Return flights