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

Return flights

02 Dec - 09 Dec	Spirit Airlines
02 Dec - 23 Dec	Turkish Airlines
02 Dec - 20 Dec	Turkish Airlines
05 Dec - 14 Dec	Hawaiian Airlines
10 Dec - 17 Dec	Spirit Airlines
31 Dec - 18 Jan	Turkish Airlines
12 Dec - 24 Dec	Spirit Airlines
11 Dec - 15 Jan	Spirit Airlines
11 Dec - 18 Dec	Turkish Airlines
23 Dec - 19 Jan	Air Canada
24 Dec - 12 Jan	Spirit Airlines
10 Dec - 23 Dec	Air Canada
24 Dec - 19 Jan	Air Canada
23 Dec - 18 Jan	Hawaiian Airlines
23 Dec - 29 Dec	Air Canada
15 Dec - 23 Dec	Air Canada
22 Dec - 15 Jan	Hawaiian Airlines
22 Dec - 16 Jan	Hawaiian Airlines
12 Dec - 10 Jan	LOT
24 Dec - 09 Jan	Frontier Airlines

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 $863

Return flights