AirHint found the following cheapest return flights from Chicago (ORD) to Athens (ATH) in September 2026 (see full year).
Return flights
| 08 Sep - 17 Sep | Air France | ||
| 23 Sep - 01 Oct | Lufthansa | ||
| 01 Sep - 07 Sep | Air France | ||
| 01 Sep - 07 Sep | British Airways | direct |
Also check the deals for one-way flights from Chicago to Athens in September.
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