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

Return flights

05 Dec - 14 Dec	Frontier Airlines
01 Dec - 14 Dec	Porter Airlines (Canada) Ltd
07 Dec - 14 Dec	Frontier Airlines
08 Dec - 14 Dec	Frontier Airlines
04 Dec - 09 Dec	Frontier Airlines
06 Dec - 15 Dec	Frontier Airlines
08 Dec - 15 Dec	Frontier Airlines
08 Dec - 19 Dec	Delta
06 Dec - 14 Dec	Delta
09 Dec - 09 Jan	Delta
23 Dec - 18 Jan	Delta
23 Dec - 17 Jan	Delta
24 Dec - 13 Jan	Delta
16 Dec - 30 Dec	Frontier Airlines
26 Dec - 25 Jan	Delta
22 Dec - 11 Jan	Delta
24 Dec - 10 Jan	Delta
21 Dec - 12 Jan	Delta
21 Dec - 13 Jan	Delta
21 Dec - 14 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 757€

Return flights