AirHint found the following cheapest return flights from Ontario (ONT) to Athens (ATH) in September 2026 (see full year).
Return flights
| 20 Sep - 28 Sep | British Airways | ||
| 22 Sep - 30 Sep | British Airways | ||
| 27 Sep - 05 Oct | British Airways | ||
| 03 Sep - 05 Sep | British Airways | ||
| 18 Sep - 26 Sep | Turkish Airlines | ||
| 28 Sep - 06 Oct | Turkish Airlines |
Also check the deals for one-way flights from Ontario to Athens in September.
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