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

Return flights

16 Oct - 30 Oct	Spirit Airlines
12 Oct - 26 Oct	Spirit Airlines
13 Oct - 16 Oct	Spirit Airlines
05 Oct - 19 Oct	WestJet
12 Oct - 25 Oct	Spirit Airlines
18 Oct - 01 Nov	Frontier Airlines
18 Oct - 30 Oct	Air Canada
06 Oct - 28 Nov	WestJet
06 Oct - 28 Nov	Delta	direct
01 Oct - 31 Oct	Delta	direct
16 Oct - 30 Oct	Delta	direct
18 Oct - 30 Oct	Delta	direct
18 Oct - 01 Nov	Delta	direct
05 Oct - 19 Oct	Korean Air	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 $934

Return flights