AirHint found the following cheapest return flights from Washington (DCA) to Seoul (ICN) in December 2025 (see full year).

Return flights

05 Dec - 12 Dec	Frontier Airlines
04 Dec - 13 Dec	Air Canada
01 Dec - 31 Jan	Air Canada
03 Dec - 11 Dec	Air Canada
12 Dec - 18 Dec	Frontier Airlines
15 Dec - 21 Jan	Frontier Airlines
15 Dec - 26 Jan	Frontier Airlines
15 Dec - 18 Jan	Air Canada
15 Dec - 17 Jan	Frontier Airlines
16 Dec - 21 Jan	Hawaiian Airlines
16 Dec - 25 Jan	Hawaiian Airlines
16 Dec - 23 Jan	Hawaiian Airlines
16 Dec - 20 Jan	Hawaiian Airlines
15 Dec - 20 Jan	Air Canada
12 Dec - 20 Dec	Frontier Airlines
02 Dec - 07 Dec	Cathay Pacific
12 Dec - 23 Dec	Air Canada
14 Dec - 28 Dec	Frontier Airlines
05 Dec - 27 Dec	Cathay Pacific
17 Dec - 20 Dec	Air Canada

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

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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Cheapest return flights from Washington to Seoul in December from $971

Return flights