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

Return flights

07 Dec - 27 Dec	Air Canada
08 Dec - 27 Dec	Air Canada
10 Dec - 12 Jan	Air Canada
01 Dec - 30 Dec	Air Canada
28 Dec - 08 Jan	Air Canada
01 Dec - 13 Dec	Air Canada
15 Dec - 07 Jan	Finnair
09 Dec - 27 Dec	Air Canada
21 Dec - 18 Jan	Finnair
21 Dec - 17 Jan	Air Canada
21 Dec - 11 Jan	Finnair
22 Dec - 27 Dec	Air Canada
20 Dec - 11 Jan	Finnair
13 Dec - 18 Jan	Finnair
24 Dec - 31 Dec	Air Canada
09 Dec - 16 Dec	Air Canada
28 Dec - 03 Jan	Air Canada
20 Dec - 31 Dec	Air Canada
23 Dec - 30 Dec	Air Canada
19 Dec - 11 Jan	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 $1033

Return flights