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

Return flights

01 Dec - 08 Dec	WestJet
04 Dec - 12 Dec	Spirit Airlines
10 Dec - 17 Dec	Turkish Airlines
01 Dec - 13 Dec	Turkish Airlines
27 Dec - 15 Jan	Turkish Airlines
27 Dec - 07 Jan	Turkish Airlines
30 Dec - 10 Jan	LOT
16 Dec - 17 Jan	LOT
12 Dec - 15 Jan	Turkish Airlines
13 Dec - 17 Jan	Turkish Airlines
13 Dec - 10 Jan	Turkish Airlines
15 Dec - 19 Jan	Lufthansa
14 Dec - 10 Jan	Air France
23 Dec - 09 Jan	Air France
22 Dec - 30 Dec	Air France
22 Dec - 31 Dec	Air France
01 Dec - 08 Dec	Delta	direct
10 Dec - 17 Dec	Delta	direct
04 Dec - 12 Dec	Delta	direct
01 Dec - 13 Dec	Delta	direct

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 799€

Return flights