Cheapest return flights from Washington to Seoul in September from $1121

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

Return flights

01 Sep - 24 Sep Air Canada
16 Sep - 23 Sep Air Canada
01 Sep - 10 Sep Air Canada
19 Sep - 14 Oct Alaska Airlines
14 Sep - 25 Sep Air Canada
07 Sep - 27 Sep Air Canada
09 Sep - 26 Oct Alaska Airlines
02 Sep - 23 Sep Asiana Airlines
11 Sep - 22 Sep Cathay Pacific

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

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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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