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

Return flights

27 Aug - 03 Sep	Cathay Pacific
26 Aug - 12 Sep	Cathay Pacific
25 Aug - 11 Sep	Cathay Pacific
25 Aug - 12 Sep	Cathay Pacific
16 Aug - 26 Aug	Frontier Airlines
11 Aug - 18 Aug	Frontier Airlines
21 Aug - 27 Aug	Spirit Airlines
22 Aug - 25 Aug	WestJet
13 Aug - 20 Aug	Cathay Pacific
17 Aug - 23 Aug	Frontier Airlines
07 Aug - 18 Aug	WestJet
09 Aug - 17 Aug	Spirit Airlines
03 Aug - 17 Aug	WestJet
07 Aug - 14 Aug	WestJet
30 Aug - 05 Sep	Hawaiian Airlines
25 Aug - 11 Sep	Delta	direct
27 Aug - 03 Sep	Delta	direct
25 Aug - 12 Sep	Delta	direct
26 Aug - 12 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 678€

Return flights