AirHint found the following cheapest return flights from Chicago (ORD) to Athens (ATH) in September 2026 (see full year).

Return flights

15 Sep - 27 Sep	Turkish Airlines
03 Sep - 17 Sep	Turkish Airlines
22 Sep - 06 Oct	Turkish Airlines
23 Sep - 01 Oct	Turkish Airlines
25 Sep - 09 Oct	Turkish Airlines
25 Sep - 04 Oct	Turkish Airlines
04 Sep - 12 Sep	Scandinavian Airlines
15 Sep - 28 Sep	Scandinavian Airlines
16 Sep - 27 Sep	Scandinavian Airlines
22 Sep - 06 Oct	Finnair	direct
23 Sep - 01 Oct	Finnair	direct
03 Sep - 17 Sep	Finnair	direct
25 Sep - 09 Oct	Finnair	direct
15 Sep - 27 Sep	Finnair	direct

Also check the deals for one-way flights from Chicago to Athens in September.

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 September from $509

Return flights