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

Return flights

01 Oct - 21 Oct	WestJet
17 Oct - 01 Nov	WestJet
15 Oct - 31 Oct	WestJet
16 Oct - 30 Oct	Spirit Airlines
30 Oct - 06 Nov	Frontier Airlines
25 Oct - 02 Nov	Frontier Airlines
01 Oct - 21 Oct	Delta	direct
01 Oct - 31 Oct	Delta	direct
15 Oct - 31 Oct	Delta	direct
16 Oct - 26 Oct	Delta
17 Oct - 01 Nov	Delta	direct
30 Oct - 06 Nov	Delta	direct
25 Oct - 02 Nov	Delta	direct

Also check the deals for one-way flights from Detroit 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 Detroit to Seoul in October from 683€

Return flights