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

Return flights

14 Sep - 30 Oct	Lufthansa
14 Sep - 15 Oct	Lufthansa
14 Sep - 07 Oct	Lufthansa
15 Sep - 21 Oct	Lufthansa
15 Sep - 30 Oct	Lufthansa
16 Sep - 30 Oct	Lufthansa
13 Sep - 21 Oct	Lufthansa
13 Sep - 30 Oct	Lufthansa
12 Sep - 21 Oct	Delta
12 Sep - 30 Oct	Delta
14 Sep - 28 Sep	Frontier Airlines

Also check the deals for one-way flights from Detroit to Zagreb 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 Zagreb in September from $634

Return flights