Cheapest return DEN–FRA flights, September

AirHint found the following cheapest return flights from Denver (DEN) to Frankfurt (FRA) in September 2026 (see full year).

Return flights

12 Sep - 19 Sep Turkish Airlines
19 Sep - 03 Oct Turkish Airlines
29 Sep - 13 Oct Turkish Airlines
12 Sep - 18 Sep Condor
30 Sep - 14 Oct Condor
03 Sep - 17 Sep Turkish Airlines
22 Sep - 28 Sep Condor
21 Sep - 28 Sep Condor
30 Sep - 14 Oct Lufthansa direct

Also check the deals for one-way flights from Denver to Frankfurt in September.

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