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

Return flights

23 Sep - 07 Oct	Condor
16 Sep - 23 Sep	Condor
26 Sep - 07 Oct	Condor
13 Sep - 22 Sep	Condor
10 Sep - 17 Sep	Condor
26 Sep - 10 Oct	Condor
24 Sep - 05 Oct	Spirit Airlines
21 Sep - 30 Sep	Condor
19 Sep - 22 Sep	Condor
21 Sep - 30 Sep	Air France	direct
23 Sep - 30 Sep	Delta	direct
23 Sep - 07 Oct	Delta	direct
19 Sep - 30 Sep	Condor
19 Sep - 21 Sep	Spirit Airlines
17 Sep - 26 Sep	Spirit Airlines
26 Sep - 10 Oct	Lufthansa	direct
24 Sep - 05 Oct	Virgin Atlantic	direct
26 Sep - 07 Oct	Lufthansa	direct

Also check the deals for one-way flights from Detroit to Frankfurt 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 Frankfurt in September from $530

Return flights