AirHint found the following cheapest return flights from Chicago (ORD) to Seoul (ICN) in March 2026 (see full year).

Return flights

16 Mar - 23 Mar	Cathay Pacific
22 Mar - 26 Mar	Cathay Pacific
20 Mar - 30 Mar	Air Canada
18 Mar - 01 Apr	Cathay Pacific
13 Mar - 22 Mar	Cathay Pacific
14 Mar - 22 Mar	Cathay Pacific
13 Mar - 23 Mar	Cathay Pacific
16 Mar - 23 Mar	Korean Air	direct
18 Mar - 01 Apr	Delta	direct
20 Mar - 30 Mar	Delta	direct
13 Mar - 22 Mar	Delta	direct
14 Mar - 22 Mar	Delta	direct

Also check the deals for one-way flights from Chicago to Seoul in March.

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 March from $742

Return flights