Cheapest return flights from Chicago to Seoul in September from 976€

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

Return flights

19 Sep - 24 Sep Frontier Airlines
29 Sep - 06 Oct Frontier Airlines
01 Sep - 08 Sep Frontier Airlines
09 Sep - 16 Sep Delta
21 Sep - 26 Sep Delta
06 Sep - 24 Sep Delta
06 Sep - 14 Sep Delta
20 Sep - 03 Oct Delta

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

Skyscanner

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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