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

Return flights

12 Dec - 09 Jan	Air Canada
13 Dec - 08 Jan	Air Canada
16 Dec - 25 Jan	Air Canada
17 Dec - 31 Dec	Air France
24 Dec - 31 Dec	Air France
24 Dec - 31 Dec	Delta	direct
18 Dec - 31 Dec	LOT
18 Dec - 06 Jan	LOT
01 Dec - 03 Jan	United
17 Dec - 31 Dec	Delta	direct
18 Dec - 31 Dec	Delta	direct
18 Dec - 06 Jan	Delta	direct
16 Dec - 25 Jan	Delta	direct
12 Dec - 09 Jan	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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Chicago to Seoul in December from 958€

Return flights