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

Return flights

11 Dec - 15 Dec	Frontier Airlines
17 Dec - 08 Jan	Frontier Airlines
14 Dec - 28 Dec	Scandinavian Airlines
13 Dec - 20 Dec	Icelandair
02 Dec - 09 Dec	Icelandair
05 Dec - 12 Dec	Icelandair
02 Dec - 09 Dec	Lufthansa	direct
08 Dec - 15 Dec	Icelandair
11 Dec - 18 Dec	Icelandair
24 Dec - 30 Dec	Condor
08 Dec - 15 Dec	Lufthansa	direct
20 Dec - 09 Jan	Icelandair
21 Dec - 09 Jan	Icelandair
22 Dec - 06 Jan	jetBlue
18 Dec - 08 Jan	Frontier Airlines
19 Dec - 09 Jan	Icelandair
20 Dec - 10 Jan	Icelandair
21 Dec - 05 Jan	Icelandair
17 Dec - 01 Jan	jetBlue
21 Dec - 01 Jan	jetBlue

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

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 December from $726

Return flights