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

Return flights

09 Dec - 16 Dec	Air Canada
08 Dec - 20 Dec	Air Canada
05 Dec - 30 Dec	Air Canada
01 Dec - 22 Dec	Turkish Airlines
01 Dec - 30 Dec	Air Canada
05 Dec - 31 Dec	Turkish Airlines
29 Dec - 24 Jan	Air Canada
13 Dec - 20 Dec	Turkish Airlines
21 Dec - 27 Dec	Air Canada
26 Dec - 11 Jan	Air Canada
26 Dec - 10 Jan	Air Canada
15 Dec - 15 Jan	Air France
20 Dec - 29 Dec	Air Canada
26 Dec - 02 Jan	Air Canada
17 Dec - 06 Jan	Austrian Airlines
25 Dec - 02 Jan	TAP
18 Dec - 31 Dec	Turkish Airlines
14 Dec - 02 Jan	Air Canada
20 Dec - 10 Jan	Turkish Airlines
16 Dec - 02 Jan	TAP

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 $990

Return flights