Cheapest return flights from Seattle to Seoul in September from $768

Best time to book flights for Seattle (SEA) to Seoul (ICN) flights at AirHint

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

Return flights

03 Sep - 17 Sep Air Canada
08 Sep - 25 Sep China Eastern
01 Sep - 15 Sep Air Canada
23 Sep - 28 Oct Air Canada
25 Sep - 30 Sep STARLUX Airlines
13 Sep - 20 Sep Air Canada
29 Sep - 06 Oct WestJet
12 Sep - 13 Sep China Airlines
19 Sep - 26 Sep EVA Air
19 Sep - 26 Sep Delta direct
13 Sep - 20 Sep Delta direct
03 Sep - 17 Sep Asiana Airlines direct
23 Sep - 28 Oct Asiana Airlines direct
29 Sep - 06 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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