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

Return flights

02 Dec - 09 Dec	Brussels Airlines
09 Dec - 16 Dec	Brussels Airlines
03 Dec - 10 Dec	Lufthansa
08 Dec - 15 Dec	Lufthansa
01 Dec - 08 Dec	British Airways
10 Dec - 17 Dec	British Airways
05 Dec - 12 Dec	Icelandair
04 Dec - 11 Dec	United
07 Dec - 14 Dec	British Airways
11 Dec - 18 Dec	British Airways
24 Dec - 13 Jan	United
24 Dec - 14 Jan	Lufthansa
24 Dec - 20 Jan	Lufthansa
24 Dec - 15 Jan	United
24 Dec - 16 Jan	Lufthansa
31 Dec - 07 Jan	British Airways
25 Dec - 16 Jan	Delta
12 Dec - 07 Jan	British Airways
16 Dec - 12 Jan	British Airways
30 Dec - 09 Jan	Lufthansa

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 378€

Return flights