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

Return flights

07 Jan - 18 Jan	Frontier Airlines
07 Jan - 19 Jan	Frontier Airlines
30 Jan - 24 Feb	Frontier Airlines
06 Jan - 27 Jan	Frontier Airlines
05 Jan - 20 Jan	Turkish Airlines
05 Jan - 26 Jan	Hawaiian Airlines
14 Jan - 21 Jan	Frontier Airlines
21 Jan - 18 Feb	Hawaiian Airlines
06 Jan - 13 Jan	Turkish Airlines
15 Jan - 09 Feb	Turkish Airlines
12 Jan - 14 Feb	Turkish Airlines
02 Jan - 11 Jan	Saudia
14 Jan - 21 Jan	Delta	direct
21 Jan - 18 Feb	Delta	direct
15 Jan - 09 Feb	Delta	direct
12 Jan - 14 Feb	Delta	direct
30 Jan - 24 Feb	Delta	direct
09 Jan - 11 Jan	Air France

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 719€

Return flights