Cheapest return flights from Seattle to Seoul in September from 663€

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

Return flights

11 Sep - 18 Sep Air Canada
15 Sep - 19 Sep Air Canada
11 Sep - 20 Sep Air Canada
14 Sep - 20 Sep Air Canada
30 Sep - 12 Oct Air Canada
26 Sep - 16 Oct Air Canada
12 Sep - 16 Sep Air Canada
20 Sep - 06 Oct Air Canada
20 Sep - 23 Sep Asiana Airlines direct
30 Sep - 12 Oct Asiana Airlines direct
26 Sep - 16 Oct Asiana Airlines direct
08 Sep - 13 Sep Air Canada
20 Sep - 06 Oct Asiana Airlines direct
26 Sep - 08 Oct Delta direct
21 Sep - 29 Sep Delta direct
08 Sep - 14 Sep Asiana Airlines direct
09 Sep - 14 Sep Asiana Airlines direct
26 Sep - 03 Oct Delta direct
29 Sep - 20 Oct Delta direct
27 Sep - 05 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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