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

Return flights

11 Dec - 16 Dec	Frontier Airlines
30 Dec - 14 Jan	Frontier Airlines
12 Dec - 27 Dec	Alaska Airlines
23 Dec - 28 Dec	Frontier Airlines
10 Dec - 27 Dec	Hawaiian Airlines
11 Dec - 13 Dec	Hawaiian Airlines
13 Dec - 06 Jan	Turkish Airlines
17 Dec - 02 Jan	Turkish Airlines
19 Dec - 03 Jan	Frontier Airlines
29 Dec - 18 Jan	Asiana Airlines

Also check the deals for one-way flights from Denver 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 Denver to Seoul in December from $1064

Return flights