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

Return flights

22 Oct - 28 Oct	Porter Airlines (Canada) Ltd
21 Oct - 28 Oct	Frontier Airlines
16 Oct - 28 Oct	Frontier Airlines
16 Oct - 19 Oct	Frontier Airlines
24 Oct - 12 Nov	Delta
21 Oct - 01 Nov	Delta
23 Oct - 01 Nov	Delta
22 Oct - 14 Nov	Delta
09 Oct - 16 Oct	Korean Air
15 Oct - 22 Oct	Korean Air
24 Oct - 08 Nov	Delta
16 Oct - 03 Nov	Delta
16 Oct - 09 Nov	Delta
03 Oct - 09 Oct	WestJet
13 Oct - 20 Oct	Korean Air
17 Oct - 09 Nov	Delta
15 Oct - 19 Oct	WestJet
30 Oct - 02 Nov	Delta
10 Oct - 13 Oct	Delta

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 756€

Return flights