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

Return flights

21 Aug - 28 Aug	Frontier Airlines
20 Aug - 28 Aug	Delta	direct
21 Aug - 28 Aug	Delta	direct
26 Aug - 06 Sep	Delta	direct
18 Aug - 25 Aug	Delta	direct
25 Aug - 28 Aug	Delta	direct
24 Aug - 28 Aug	Delta
24 Aug - 27 Aug	Delta
18 Aug - 30 Aug	Delta	direct
17 Aug - 24 Aug	Delta
23 Aug - 28 Aug	Delta	direct

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

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 August from 1004€

Return flights