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
25 Sep - 08 Oct	Air Transat
22 Sep - 06 Oct	FrenchBee
26 Sep - 08 Oct	Air Transat
29 Sep - 22 Oct	FrenchBee
28 Sep - 10 Oct	FrenchBee
26 Sep - 03 Oct	FrenchBee
21 Sep - 05 Oct	FrenchBee
19 Sep - 26 Sep	Delta
17 Sep - 25 Sep	FrenchBee
18 Sep - 25 Sep	Air France
17 Sep - 24 Sep	FrenchBee
17 Sep - 26 Sep	FrenchBee
22 Sep - 29 Sep	FrenchBee
17 Sep - 29 Sep	FrenchBee
17 Sep - 28 Sep	FrenchBee
19 Sep - 30 Sep	FrenchBee
21 Sep - 28 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 515€

Return flights