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

Return flights

01 Dec - 15 Jan	Delta
09 Dec - 27 Dec	Delta
10 Dec - 13 Jan	Delta
22 Dec - 30 Dec	Delta
26 Dec - 24 Jan	Delta
10 Dec - 07 Jan	Delta
10 Dec - 08 Jan	Delta
22 Dec - 31 Dec	Delta
11 Dec - 15 Jan	Delta
08 Dec - 11 Dec	Delta
12 Dec - 28 Dec	Delta
20 Dec - 19 Jan	Delta
28 Dec - 11 Jan	Delta
20 Dec - 28 Dec	Delta
21 Dec - 11 Jan	Delta
11 Dec - 08 Jan	Delta
19 Dec - 26 Dec	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 $1813

Return flights