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

Return flights

25 Aug - 01 Sep	Cathay Pacific
21 Aug - 31 Aug	Cathay Pacific
26 Aug - 09 Sep	Cathay Pacific
17 Aug - 28 Aug	Cathay Pacific
17 Aug - 31 Aug	Cathay Pacific
22 Aug - 31 Aug	Cathay Pacific
31 Aug - 30 Sep	Hawaiian Airlines
16 Aug - 26 Aug	Frontier Airlines
16 Aug - 23 Aug	Frontier Airlines
04 Aug - 19 Aug	Turkish Airlines
10 Aug - 23 Aug	Turkish Airlines
17 Aug - 23 Aug	Turkish Airlines
11 Aug - 22 Aug	Turkish Airlines
26 Aug - 09 Sep	Delta	direct
25 Aug - 01 Sep	Delta	direct
22 Aug - 03 Sep	Delta	direct

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

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 August from 679€

Return flights