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

Return flights

26 Jan - 08 Feb	Frontier Airlines
22 Jan - 31 Jan	Frontier Airlines
23 Jan - 20 Feb	Frontier Airlines
31 Jan - 23 Feb	Hawaiian Airlines
12 Jan - 26 Jan	Frontier Airlines
15 Jan - 22 Jan	Turkish Airlines
14 Jan - 21 Jan	Southern Airways Express
07 Jan - 14 Jan	Frontier Airlines
21 Jan - 26 Jan	Turkish Airlines
07 Jan - 19 Jan	Turkish Airlines
14 Jan - 21 Jan	Delta	direct
12 Jan - 16 Feb	Delta	direct
12 Jan - 26 Jan	Korean Air	direct
22 Jan - 31 Jan	Delta	direct
26 Jan - 08 Feb	Delta	direct
23 Jan - 20 Feb	Delta	direct

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 742€

Return flights