Cheapest return flights from Seattle to Seoul in September from 671€

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

Return flights

02 Sep - 17 Sep Alaska Airlines
17 Sep - 25 Sep Air Canada
09 Sep - 16 Sep Air Canada
09 Sep - 15 Oct Air Canada
18 Sep - 25 Sep Air Canada
11 Sep - 18 Sep Air Canada
10 Sep - 22 Sep Air Canada
08 Sep - 17 Sep Alaska Airlines
25 Sep - 30 Sep Air Canada
15 Sep - 30 Sep Air Canada
10 Sep - 30 Sep Air Canada
17 Sep - 13 Oct Air Canada
30 Sep - 28 Oct Air Canada
24 Sep - 15 Oct Alaska Airlines
20 Sep - 10 Oct Air Canada
27 Sep - 05 Oct Delta direct
16 Sep - 02 Oct Delta direct
09 Sep - 15 Oct Korean Air direct
24 Sep - 15 Oct Delta direct
17 Sep - 13 Oct Delta direct

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

Skyscanner

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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