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

Return flights

09 Dec - 16 Dec	Hawaiian Airlines
21 Dec - 25 Jan	Frontier Airlines
09 Dec - 19 Dec	WestJet
12 Dec - 15 Dec	Iberia
10 Dec - 23 Dec	Air Canada
23 Dec - 15 Jan	Air Canada
13 Dec - 29 Dec	Air Canada
15 Dec - 31 Dec	jetBlue
24 Dec - 14 Jan	United
29 Dec - 14 Jan	United
18 Dec - 21 Dec	WestJet
18 Dec - 25 Dec	WestJet
22 Dec - 13 Jan	Air Canada
17 Dec - 30 Dec	Alaska Airlines
18 Dec - 30 Dec	WestJet
23 Dec - 14 Jan	United
17 Dec - 06 Jan	Frontier Airlines
30 Dec - 27 Jan	Emirates
15 Dec - 06 Jan	United
17 Dec - 09 Jan	United

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 1228€

Return flights