Cheapest return flights from Seattle to Seoul in September from $694

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

Return flights

14 Sep - 21 Sep Cathay Pacific
01 Sep - 10 Sep Cathay Pacific
15 Sep - 29 Sep Cathay Pacific
07 Sep - 14 Sep Cathay Pacific
07 Sep - 21 Sep Cathay Pacific
21 Sep - 28 Sep Cathay Pacific
03 Sep - 17 Sep Cathay Pacific
29 Sep - 27 Oct Cathay Pacific
07 Sep - 18 Sep Cathay Pacific
05 Sep - 22 Sep Cathay Pacific
16 Sep - 03 Oct Cathay Pacific
05 Sep - 12 Sep Cathay Pacific
16 Sep - 03 Oct Korean Air direct
29 Sep - 27 Oct Delta direct

Also check the deals for one-way flights from Seattle to Seoul in September.

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