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

Return flights

25 Aug - 10 Sep	Turkish Airlines
25 Aug - 03 Sep	Turkish Airlines
25 Aug - 16 Sep	Turkish Airlines
31 Aug - 16 Sep	United
27 Aug - 21 Sep	Turkish Airlines
18 Aug - 16 Sep	Turkish Airlines
19 Aug - 27 Aug	SWISS
20 Aug - 27 Aug	SWISS
24 Aug - 10 Sep	TAP
26 Aug - 03 Sep	Turkish Airlines
31 Aug - 04 Sep	Spirit Airlines
18 Aug - 28 Aug	SWISS
26 Aug - 16 Sep	Turkish Airlines
19 Aug - 29 Aug	United	direct
19 Aug - 27 Aug	United	direct
20 Aug - 27 Aug	United	direct
23 Aug - 30 Aug	Spirit Airlines
20 Aug - 26 Aug	Air Canada
19 Aug - 25 Aug	SWISS
18 Aug - 25 Aug	SWISS

Also check the deals for one-way flights from Chicago 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 Chicago to Athens in August from 470€

Return flights