Cheapest return flights from Washington to Seoul in December from $778

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

Return flights

03 Dec - 14 Dec Frontier Airlines
05 Dec - 13 Dec Frontier Airlines
04 Dec - 14 Dec Turkish Airlines
02 Dec - 09 Dec Frontier Airlines
04 Dec - 13 Dec Turkish Airlines
08 Dec - 15 Dec Hawaiian Airlines
03 Dec - 22 Dec Air Canada
09 Dec - 16 Dec Hawaiian Airlines
31 Dec - 20 Jan Turkish Airlines
10 Dec - 17 Dec Icelandair
07 Dec - 24 Jan Turkish Airlines
28 Dec - 18 Jan Turkish Airlines
10 Dec - 26 Dec Turkish Airlines
11 Dec - 17 Jan Alaska Airlines
27 Dec - 16 Jan Frontier Airlines
29 Dec - 11 Jan Turkish Airlines
27 Dec - 09 Jan Frontier Airlines
24 Dec - 13 Jan Frontier Airlines
24 Dec - 09 Jan Frontier Airlines
26 Dec - 09 Jan Frontier Airlines

Also check the deals for one-way flights from Washington to Seoul in December.

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