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

Return flights

31 Jan - 07 Feb	Frontier Airlines
24 Jan - 27 Feb	Frontier Airlines
12 Jan - 26 Jan	Frontier Airlines
24 Jan - 31 Jan	Frontier Airlines
20 Jan - 25 Jan	Frontier Airlines
24 Jan - 28 Feb	Frontier Airlines
20 Jan - 26 Feb	Frontier Airlines
13 Jan - 27 Jan	Air Canada
24 Jan - 26 Feb	Frontier Airlines
23 Jan - 29 Jan	Air Canada
19 Jan - 03 Feb	jetBlue
22 Jan - 26 Feb	Frontier Airlines
28 Jan - 30 Jan	Air Canada
23 Jan - 26 Feb	Frontier Airlines
15 Jan - 22 Jan	Air Canada
29 Jan - 28 Feb	Air Canada
16 Jan - 23 Jan	Air Canada
16 Jan - 25 Jan	Air Canada
20 Jan - 23 Jan	Air Canada
26 Jan - 02 Feb	Emirates

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

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 January from $913

Return flights