Cheapest return flights from Ontario to Athens in September from $912

Best time to book flights for Ontario (ONT) to Athens (ATH) flights at AirHint

AirHint found the following cheapest return flights from Ontario (ONT) to Athens (ATH) in September 2025 (see full year).

Return flights

09 Sep - 08 Oct British Airways
16 Sep - 22 Sep British Airways
28 Sep - 12 Oct British Airways
01 Sep - 18 Sep KLM
01 Sep - 07 Sep British Airways
28 Sep - 15 Oct British Airways
26 Sep - 19 Oct KLM
12 Sep - 05 Oct KLM
13 Sep - 26 Sep KLM
07 Sep - 15 Sep Air Serbia
29 Sep - 13 Oct KLM
22 Sep - 29 Sep Air Serbia
23 Sep - 10 Oct KLM
13 Sep - 04 Oct KLM
12 Sep - 19 Sep KLM

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

Skyscanner

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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