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

Return flights

14 Oct - 28 Oct	Cathay Pacific
16 Oct - 28 Oct	Cathay Pacific
16 Oct - 23 Oct	Cathay Pacific
26 Oct - 31 Oct	Cathay Pacific
20 Oct - 03 Nov	Cathay Pacific
02 Oct - 19 Oct	WestJet
02 Oct - 11 Oct	WestJet
23 Oct - 01 Nov	WestJet
15 Oct - 22 Oct	Air Canada
06 Oct - 13 Oct	Turkish Airlines
06 Oct - 13 Oct	Korean Air	direct
20 Oct - 03 Nov	Delta	direct
02 Oct - 11 Oct	Korean Air	direct
23 Oct - 01 Nov	Delta	direct
21 Oct - 02 Nov	Delta	direct
24 Oct - 08 Nov	Delta	direct
30 Oct - 02 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 652€

Return flights