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

Return flights

10 Dec - 16 Dec	Icelandair
24 Dec - 17 Jan	Condor
15 Dec - 10 Jan	Icelandair
10 Dec - 22 Dec	Brussels Airlines
09 Dec - 14 Dec	Brussels Airlines
08 Dec - 22 Dec	Scandinavian Airlines
13 Dec - 22 Dec	Turkish Airlines
28 Dec - 13 Jan	Frontier Airlines
17 Dec - 10 Jan	Frontier Airlines
14 Dec - 23 Dec	Air Canada
23 Dec - 17 Jan	Frontier Airlines
26 Dec - 02 Jan	Turkish Airlines
24 Dec - 29 Dec	Alaska Airlines
07 Dec - 14 Dec	Icelandair
05 Dec - 12 Dec	Icelandair
10 Dec - 02 Jan	Frontier Airlines
01 Dec - 08 Dec	Icelandair
26 Dec - 06 Jan	Turkish Airlines
26 Dec - 05 Jan	Turkish Airlines
26 Dec - 03 Jan	Frontier Airlines

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.

Book a cheap hotel in Frankfurt

Cheap car rent in Frankfurt

Cheapest return flights from Denver to Frankfurt in December from $614

Return flights