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

Return flights

15 Aug - 29 Aug	Frontier Airlines
17 Aug - 24 Aug	Turkish Airlines
19 Aug - 26 Aug	Turkish Airlines
23 Aug - 30 Aug	Turkish Airlines
19 Aug - 24 Aug	Turkish Airlines
15 Aug - 22 Aug	Turkish Airlines
23 Aug - 02 Sep	Frontier Airlines
27 Aug - 12 Sep	SWISS
29 Aug - 12 Sep	Frontier Airlines
27 Aug - 01 Sep	Icelandair
25 Aug - 08 Sep	Lufthansa
21 Aug - 28 Aug	United
25 Aug - 01 Sep	United
28 Aug - 04 Sep	United
12 Aug - 23 Aug	United
09 Aug - 16 Aug	Icelandair
30 Aug - 06 Sep	United
02 Aug - 11 Aug	Frontier Airlines

Also check the deals for one-way flights from Denver to Athens in August.

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 August from 528€

Return flights