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

Return flights

30 Dec - 09 Jan	British Airways
24 Dec - 07 Jan	Frontier Airlines
14 Dec - 28 Dec	Frontier Airlines
16 Dec - 23 Dec	Turkish Airlines
24 Dec - 06 Jan	Frontier Airlines
24 Dec - 31 Dec	Lufthansa
01 Dec - 01 Jan	Frontier Airlines
19 Dec - 27 Dec	Frontier Airlines
03 Dec - 22 Dec	British Airways
20 Dec - 26 Dec	Lufthansa
30 Dec - 06 Jan	Turkish Airlines
20 Dec - 27 Dec	Turkish Airlines
26 Dec - 02 Jan	Turkish Airlines

Also check the deals for one-way flights from Denver to Athens 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 Athens in December from $876

Return flights