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

One-Way flights

24 Sep	FrenchBee
10 Sep	FrenchBee
19 Sep	FrenchBee
22 Sep	Porter Airlines (Canada) Ltd
23 Sep	Porter Airlines (Canada) Ltd
08 Sep	FrenchBee
15 Sep	FrenchBee
14 Sep	Porter Airlines (Canada) Ltd
09 Sep	Air Transat
01 Sep	Air Transat

Also check the deals for return 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 one-way flights from Montreal to Athens in September from 241€

One-Way flights