Cheapest return flights from Seattle to Seoul in September from $817

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

07 Sep - 20 Sep Air Canada
10 Sep - 18 Sep Air Canada
04 Sep - 23 Sep Air Canada
03 Sep - 16 Sep China Airlines
10 Sep - 20 Sep Air Canada
08 Sep - 25 Sep China Airlines
01 Sep - 29 Sep China Airlines
01 Sep - 20 Sep China Airlines
01 Sep - 29 Sep Asiana Airlines direct
04 Sep - 23 Sep Asiana Airlines 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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