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
03 Aug - 19 Aug	Icelandair
21 Aug - 04 Sep	Icelandair
10 Aug - 26 Aug	Frontier Airlines
24 Aug - 07 Sep	Aer Lingus
02 Aug - 16 Aug	Icelandair
16 Aug - 23 Aug	Air Canada
06 Aug - 15 Aug	Icelandair
05 Aug - 26 Aug	United	direct
10 Aug - 26 Aug	Lufthansa	direct
07 Aug - 14 Aug	Frontier Airlines
21 Aug - 04 Sep	Lufthansa	direct
24 Aug - 07 Sep	United	direct
06 Aug - 15 Aug	Lufthansa	direct

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 $455

Return flights