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

Return flights

31 Dec - 21 Jan	Saudia
31 Dec - 20 Jan	Saudia
26 Dec - 28 Dec	Frontier Airlines
24 Dec - 30 Dec	Southern Airways Express
29 Dec - 31 Dec	ANA
29 Dec - 05 Jan	Frontier Airlines
29 Dec - 04 Jan	Frontier Airlines
31 Dec - 21 Jan	Delta	direct
26 Dec - 02 Jan	Frontier Airlines
29 Dec - 31 Dec	Delta	direct
27 Dec - 03 Jan	Frontier Airlines
27 Dec - 05 Jan	Ethiopian Airlines
29 Dec - 03 Jan	Allegiant Air
24 Dec - 30 Dec	Delta	direct
26 Dec - 28 Dec	Delta	direct
26 Dec - 02 Jan	Delta	direct

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 1052€

Return flights