Cheapest return flights from Chicago to Seoul in September from 678€

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

Return flights

01 Sep - 08 Sep Cathay Pacific
09 Sep - 14 Sep Cathay Pacific
09 Sep - 15 Sep Cathay Pacific
09 Sep - 16 Sep Cathay Pacific
16 Sep - 23 Sep Cathay Pacific
07 Sep - 16 Sep Cathay Pacific
17 Sep - 27 Sep Cathay Pacific
12 Sep - 18 Sep Cathay Pacific
13 Sep - 27 Sep Cathay Pacific
07 Sep - 15 Sep Spirit Airlines
20 Sep - 03 Oct United

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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