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	Cathay Pacific
04 Dec - 11 Dec	Cathay Pacific
12 Dec - 09 Jan	Air Canada
12 Dec - 08 Jan	Air Canada
11 Dec - 01 Jan	Turkish Airlines
13 Dec - 31 Dec	Turkish Airlines
13 Dec - 01 Jan	Turkish Airlines
17 Dec - 07 Jan	Air Canada
21 Dec - 18 Jan	Air Canada
22 Dec - 09 Jan	Air Canada
18 Dec - 15 Jan	Air Canada
12 Dec - 31 Dec	LOT
12 Dec - 01 Jan	Turkish Airlines
24 Dec - 31 Dec	Air France
01 Dec - 08 Dec	Delta	direct
19 Dec - 18 Jan	Air Canada
19 Dec - 30 Dec	LOT
12 Dec - 31 Dec	Delta	direct
19 Dec - 30 Dec	Korean Air	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 675€

Return flights