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

Return flights

15 Jul - 29 Jul	Delta	direct
07 Jul - 18 Jul	Delta	direct
28 Jul - 04 Aug	Delta	direct
25 Jul - 01 Aug	Delta	direct
30 Jul - 24 Aug	Delta	direct
22 Jul - 28 Jul	Delta	direct
20 Jul - 09 Aug	Delta	direct
02 Jul - 09 Jul	Air Canada
06 Jul - 10 Aug	Korean Air
03 Jul - 25 Jul	Korean Air
02 Jul - 09 Jul	Korean Air	direct

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 761€

Return flights