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

Return flights

11 Sep - 01 Oct	Aegean Airlines
12 Sep - 21 Sep	Transavia France
10 Sep - 21 Sep	Transavia France
10 Sep - 25 Sep	Transavia France
10 Sep - 23 Sep	easyJet
17 Sep - 01 Oct	Transavia France
18 Sep - 01 Oct	easyJet
11 Sep - 27 Sep	easyJet
05 Sep - 21 Sep	Transavia France
09 Sep - 29 Sep	easyJet
11 Sep - 14 Sep	easyJet
12 Sep - 18 Sep	Air France
03 Sep - 01 Oct	easyJet
15 Sep - 29 Sep	Austrian Airlines
29 Sep - 06 Oct	Austrian Airlines
18 Sep - 15 Oct	Austrian Airlines
16 Sep - 16 Oct	Norse Atlantic Airways
19 Sep - 04 Oct	easyJet
26 Sep - 06 Oct	Transavia France
13 Sep - 01 Oct	Ryanair

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.

Book a cheap hotel in Montreal

Cheap car rent in Montreal

Cheapest return flights from Athens to Montreal in September from 489€

Return flights