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

Return flights

01 Mar - 30 Mar	Frontier Airlines
19 Mar - 29 Mar	Frontier Airlines
21 Mar - 29 Mar	Frontier Airlines
20 Mar - 31 Mar	Frontier Airlines
30 Mar - 12 Apr	Frontier Airlines
14 Mar - 29 Mar	Frontier Airlines
30 Mar - 22 Apr	Korean Air
31 Mar - 23 Apr	Korean Air
29 Mar - 12 Apr	Frontier Airlines
18 Mar - 25 Mar	Delta
08 Mar - 07 Apr	Korean Air
27 Mar - 06 Apr	Korean Air
06 Mar - 16 Mar	Delta
24 Mar - 04 Apr	Delta
09 Mar - 19 Mar	Korean Air
27 Mar - 10 Apr	Korean Air
28 Mar - 05 Apr	Korean Air
06 Mar - 21 Mar	Delta
28 Mar - 12 Apr	Delta
16 Mar - 20 Mar	Korean Air

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.

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Cheapest return flights from Chicago to Seoul in March from $1193

Return flights