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
14 Sep - 17 Sep	FrenchBee
14 Sep - 24 Sep	FrenchBee
15 Sep - 24 Sep	FrenchBee
15 Sep - 29 Sep	FrenchBee
29 Sep - 10 Oct	FrenchBee
22 Sep - 05 Oct	FrenchBee
22 Sep - 10 Oct	FrenchBee
17 Sep - 08 Oct	FrenchBee
10 Sep - 17 Sep	FrenchBee
28 Sep - 05 Oct	FrenchBee
29 Sep - 13 Oct	FrenchBee
17 Sep - 24 Sep	FrenchBee
01 Sep - 17 Sep	FrenchBee
15 Sep - 01 Oct	FrenchBee
28 Sep - 11 Oct	FrenchBee
14 Sep - 01 Oct	FrenchBee
07 Sep - 22 Sep	FrenchBee
08 Sep - 23 Sep	Porter Airlines (Canada) Ltd
03 Sep - 22 Sep	Air Caraibes

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 456€

Return flights