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

Return flights

06 Sep - 05 Oct	Air France
19 Sep - 05 Oct	Air France
16 Sep - 05 Oct	Air France
27 Sep - 11 Oct	Porter Airlines (Canada) Ltd
14 Sep - 27 Sep	Porter Airlines (Canada) Ltd
10 Sep - 07 Oct	Air France
30 Sep - 12 Oct	Air Canada

Also check the deals for one-way flights from Ottawa 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 Ottawa to Athens in September from $738

Return flights