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

Return flights

28 Oct - 04 Nov	Delta
29 Oct - 05 Nov	Iberia
27 Oct - 03 Nov	Iberia
27 Oct - 10 Nov	Iberia
22 Oct - 05 Nov	Iberia
24 Oct - 31 Oct	Iberia
31 Oct - 07 Nov	Iberia
15 Oct - 29 Oct	Iberia
22 Oct - 29 Oct	Iberia
21 Oct - 28 Oct	Iberia
05 Oct - 12 Oct	Iberia
12 Oct - 19 Oct	Iberia
08 Oct - 15 Oct	Air Canada

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.

Book a cheap hotel in Athens

Cheap car rent in Athens

Cheapest return flights from Ontario to Athens in October from 493€

Return flights