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

Return flights

08 Oct - 18 Oct	jetBlue
28 Oct - 04 Nov	Iberia
31 Oct - 14 Nov	Iberia
27 Oct - 03 Nov	Iberia
29 Oct - 05 Nov	Iberia
25 Oct - 01 Nov	Iberia
19 Oct - 26 Oct	Iberia
23 Oct - 30 Oct	Iberia
12 Oct - 19 Oct	Iberia
22 Oct - 29 Oct	Iberia
16 Oct - 19 Oct	Iberia
07 Oct - 12 Oct	Iberia

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

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 Ontario to Athens in October from $740

Return flights