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

Return flights

28 Dec - 12 Jan	Air Canada
01 Dec - 12 Dec	Turkish Airlines
15 Dec - 15 Jan	Air Canada
05 Dec - 31 Dec	Turkish Airlines
26 Dec - 06 Jan	Air Canada
26 Dec - 18 Jan	Air Canada
05 Dec - 04 Jan	Turkish Airlines
15 Dec - 26 Dec	Air France
12 Dec - 28 Dec	KLM
14 Dec - 11 Jan	Air France
14 Dec - 26 Dec	Air France
25 Dec - 17 Jan	KLM
25 Dec - 06 Jan	KLM
19 Dec - 23 Dec	Air Canada
16 Dec - 14 Jan	KLM
19 Dec - 31 Dec	Air France
23 Dec - 06 Jan	Lufthansa
22 Dec - 29 Dec	Air Canada
01 Dec - 12 Dec	Delta	direct
22 Dec - 29 Dec	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 845€

Return flights