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

Return flights

29 Oct - 12 Nov	Cathay Pacific
16 Oct - 25 Oct	Cathay Pacific
16 Oct - 28 Oct	Spirit Airlines
04 Oct - 17 Oct	WestJet
13 Oct - 20 Oct	Cathay Pacific
23 Oct - 07 Nov	WestJet
27 Oct - 09 Nov	Cathay Pacific
15 Oct - 26 Oct	Cathay Pacific
30 Oct - 07 Nov	Cathay Pacific
06 Oct - 20 Oct	Spirit Airlines
06 Oct - 08 Oct	Turkish Airlines
10 Oct - 17 Oct	Cathay Pacific
29 Oct - 12 Nov	Delta	direct
06 Oct - 20 Oct	Delta	direct
16 Oct - 28 Oct	Korean Air	direct
30 Oct - 07 Nov	Delta	direct
27 Oct - 09 Nov	Delta	direct
23 Oct - 07 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 $753

Return flights