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

Return flights

13 Aug - 20 Aug	Air Canada
11 Aug - 18 Aug	Icelandair
11 Aug - 23 Aug	Frontier Airlines
03 Aug - 19 Aug	Icelandair
05 Aug - 19 Aug	Icelandair
07 Aug - 14 Aug	Icelandair
19 Aug - 26 Aug	Icelandair
08 Aug - 15 Aug	Icelandair
10 Aug - 17 Aug	Icelandair
15 Aug - 22 Aug	Icelandair
27 Aug - 10 Sep	Air Canada
27 Aug - 03 Sep	United
24 Aug - 07 Sep	Icelandair
25 Aug - 01 Sep	Lufthansa	direct
24 Aug - 07 Sep	United	direct
29 Aug - 05 Sep	United	direct
31 Aug - 07 Sep	United	direct
29 Aug - 14 Sep	Air Canada

Also check the deals for one-way flights from Denver to Frankfurt 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 Denver to Frankfurt in August from 373€

Return flights