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

Return flights

28 Sep - 27 Oct	Spirit Airlines
27 Sep - 11 Oct	Spirit Airlines
24 Sep - 09 Oct	Spirit Airlines
19 Sep - 28 Sep	Spirit Airlines
18 Sep - 24 Sep	Spirit Airlines
27 Sep - 04 Oct	Spirit Airlines
20 Sep - 04 Oct	Frontier Airlines
26 Sep - 09 Oct	Air Canada
28 Sep - 27 Oct	Delta	direct
20 Sep - 04 Oct	Delta	direct
27 Sep - 11 Oct	Delta	direct
24 Sep - 09 Oct	Delta	direct
23 Sep - 30 Sep	Delta	direct
18 Sep - 24 Sep	Delta	direct

Also check the deals for one-way flights from Detroit to Seoul in September.

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 September from 759€

Return flights