Cheapest return flights from Denver to Frankfurt in September from $785

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

Return flights

24 Sep - 30 Sep Frontier Airlines
22 Sep - 05 Oct Frontier Airlines
24 Sep - 29 Sep Frontier Airlines
25 Sep - 18 Oct Frontier Airlines
29 Sep - 13 Oct Frontier Airlines
26 Sep - 18 Oct Frontier Airlines
17 Sep - 24 Sep Frontier Airlines
18 Sep - 11 Oct Frontier Airlines
19 Sep - 26 Sep Air Canada
17 Sep - 27 Sep Singapore Airlines
26 Sep - 08 Oct Turkish Airlines
29 Sep - 13 Oct Lufthansa direct
24 Sep - 30 Sep Lufthansa direct
24 Sep - 29 Sep Lufthansa direct
22 Sep - 05 Oct Lufthansa direct
26 Sep - 08 Oct Lufthansa direct
25 Sep - 18 Oct Lufthansa direct
17 Sep - 24 Sep Lufthansa direct
17 Sep - 27 Sep Lufthansa direct
19 Sep - 26 Sep Lufthansa direct

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

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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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