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

Return flights

20 Oct - 27 Oct	Cathay Pacific
30 Oct - 06 Nov	Cathay Pacific
02 Oct - 15 Oct	Cathay Pacific
02 Oct - 19 Oct	Cathay Pacific
17 Oct - 26 Oct	WestJet
01 Oct - 17 Oct	Frontier Airlines
03 Oct - 10 Oct	Cathay Pacific
12 Oct - 23 Nov	Cathay Pacific
12 Oct - 18 Oct	Cathay Pacific
15 Oct - 26 Oct	Spirit Airlines
16 Oct - 28 Oct	Spirit Airlines
15 Oct - 29 Oct	Turkish Airlines
30 Oct - 06 Nov	Delta	direct

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

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 October from 594€

Return flights