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

Return flights

05 Sep - 15 Sep	Air Transat	direct
05 Sep - 18 Sep	Air Transat	direct
05 Sep - 21 Sep	Air Transat
12 Sep - 20 Sep	Air Transat	direct
22 Sep - 01 Oct	Transavia France
22 Sep - 06 Oct	Transavia France
25 Sep - 02 Oct	Transavia France
08 Sep - 25 Sep	Air Transat
19 Sep - 04 Oct	easyJet
19 Sep - 04 Oct	Air Transat	direct
05 Sep - 21 Sep	Lufthansa	direct
19 Sep - 28 Sep	KLM
08 Sep - 25 Sep	Aegean Airlines	direct
22 Sep - 06 Oct	Aegean Airlines	direct

Also check the deals for one-way flights from Athens to Montreal 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 Athens to Montreal in September from $517

Return flights