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

Return flights

08 Dec - 15 Dec	Frontier Airlines
05 Dec - 11 Dec	Frontier Airlines
07 Dec - 15 Dec	Frontier Airlines
05 Dec - 14 Dec	Frontier Airlines
27 Dec - 09 Jan	Frontier Airlines
24 Dec - 09 Jan	Frontier Airlines
24 Dec - 10 Jan	Frontier Airlines
27 Dec - 07 Jan	Frontier Airlines
14 Dec - 15 Jan	Frontier Airlines
15 Dec - 15 Jan	Frontier Airlines
19 Dec - 20 Jan	Porter Airlines (Canada) Ltd
08 Dec - 13 Dec	Delta
22 Dec - 01 Jan	Delta
20 Dec - 28 Dec	Frontier Airlines
03 Dec - 10 Dec	Frontier Airlines
08 Dec - 22 Dec	Delta
07 Dec - 22 Dec	Delta
07 Dec - 10 Dec	Delta
22 Dec - 08 Jan	Delta
25 Dec - 02 Jan	Delta

Also check the deals for one-way flights from Chicago 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 Chicago to Seoul in December from $963

Return flights