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

Return flights

29 Sep - 08 Oct	FrenchBee
28 Sep - 08 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
29 Sep - 22 Oct	FrenchBee
28 Sep - 10 Oct	FrenchBee
26 Sep - 03 Oct	FrenchBee
21 Sep - 05 Oct	FrenchBee
21 Sep - 11 Oct	FrenchBee
26 Sep - 10 Oct	FrenchBee
28 Sep - 05 Oct	FrenchBee
21 Sep - 25 Sep	FrenchBee
19 Sep - 26 Sep	Delta
22 Sep - 29 Sep	FrenchBee
23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
19 Sep - 27 Sep	FrenchBee
21 Sep - 28 Sep	FrenchBee
20 Sep - 27 Sep	Air Transat
20 Sep - 28 Sep	Air Transat
18 Sep - 28 Sep	Air Transat
20 Sep - 28 Sep	Air Transat	direct

Also check the deals for one-way flights from Montreal 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 Montreal to Athens in September from $610

Return flights