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

Return flights

20 Jan - 30 Jan	Frontier Airlines
08 Jan - 23 Jan	Frontier Airlines
18 Jan - 25 Jan	Frontier Airlines
12 Jan - 25 Jan	Frontier Airlines
20 Jan - 27 Jan	Frontier Airlines
07 Jan - 25 Jan	Alaska Airlines
26 Jan - 05 Feb	Frontier Airlines
08 Jan - 22 Jan	Frontier Airlines
05 Jan - 23 Jan	Frontier Airlines
28 Jan - 28 Feb	Frontier Airlines
16 Jan - 25 Jan	Hawaiian Airlines
14 Jan - 21 Jan	Alaska Airlines
10 Jan - 27 Feb	Alaska Airlines
17 Jan - 01 Feb	Emirates
05 Jan - 17 Feb	Emirates
12 Jan - 16 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 751€

Return flights