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

Return flights

10 Dec - 23 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
11 Dec - 19 Jan	Air Canada
04 Dec - 11 Dec	Air Canada
12 Dec - 23 Dec	Turkish Airlines
12 Dec - 12 Jan	Air Canada
23 Dec - 19 Jan	Air Canada
11 Dec - 04 Jan	Air Canada
06 Dec - 10 Jan	Air Canada
25 Dec - 13 Jan	Air Canada
13 Dec - 17 Jan	Turkish Airlines
12 Dec - 10 Jan	LOT
12 Dec - 09 Jan	Turkish Airlines
25 Dec - 11 Jan	Air Canada
13 Dec - 28 Dec	Turkish Airlines
14 Dec - 31 Dec	Finnair
13 Dec - 29 Dec	Turkish Airlines
16 Dec - 23 Dec	LOT
16 Dec - 31 Dec	Finnair
17 Dec - 31 Dec	Finnair

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 $1016

Return flights