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

Return flights

22 Sep - 20 Oct	FrenchBee
29 Sep - 10 Oct	FrenchBee
29 Sep - 08 Oct	FrenchBee
10 Sep - 17 Sep	FrenchBee
22 Sep - 13 Oct	FrenchBee
15 Sep - 29 Sep	FrenchBee
29 Sep - 06 Oct	FrenchBee
24 Sep - 02 Oct	FrenchBee
08 Sep - 24 Sep	FrenchBee
22 Sep - 05 Oct	FrenchBee
24 Sep - 09 Oct	FrenchBee
19 Sep - 05 Oct	FrenchBee
22 Sep - 02 Oct	Porter Airlines (Canada) Ltd
07 Sep - 17 Sep	FrenchBee
17 Sep - 24 Sep	FrenchBee
11 Sep - 23 Sep	Air Transat
19 Sep - 26 Sep	Porter Airlines (Canada) Ltd
08 Sep - 26 Sep	Porter Airlines (Canada) Ltd
22 Sep - 29 Sep	FrenchBee
07 Sep - 23 Sep	FrenchBee

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 $585

Return flights