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

Return flights

05 Dec - 12 Dec	Icelandair
31 Dec - 14 Jan	Lufthansa
01 Dec - 15 Dec	Air Canada
04 Dec - 18 Dec	Turkish Airlines
01 Dec - 08 Dec	United
31 Dec - 07 Jan	United
21 Dec - 28 Dec	United
26 Dec - 03 Jan	Air Canada

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.

Book a cheap hotel in Athens

Cheap car rent in Athens

Cheapest return flights from Denver to Athens in December from $586

Return flights