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

Return flights

01 Dec - 12 Jan	Cathay Pacific
04 Dec - 11 Dec	Cathay Pacific
28 Dec - 14 Jan	Air Canada
06 Dec - 23 Dec	Air Canada
10 Dec - 19 Dec	Air Canada
08 Dec - 16 Jan	Air Canada
26 Dec - 24 Jan	Air Canada
12 Dec - 18 Jan	Air Canada
12 Dec - 10 Jan	Air Canada
12 Dec - 09 Jan	Air Canada
13 Dec - 21 Dec	Air Canada
13 Dec - 16 Jan	Air Canada
13 Dec - 09 Jan	Air Canada
17 Dec - 24 Dec	Finnair
22 Dec - 01 Jan	Air Canada
22 Dec - 29 Dec	Air Canada
22 Dec - 31 Dec	Air Canada
15 Dec - 31 Dec	Lufthansa
10 Dec - 19 Dec	Korean Air	direct
06 Dec - 23 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 $797

Return flights