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

Return flights

04 Sep - 19 Sep	Air Transat	direct
08 Sep - 24 Sep	Air Transat	direct
11 Sep - 19 Sep	Air Transat	direct
01 Sep - 07 Sep	Air Transat	direct
11 Sep - 17 Sep	Air Transat	direct
01 Sep - 10 Sep	Air Transat	direct
23 Sep - 16 Oct	British Airways
21 Sep - 01 Oct	British Airways
13 Sep - 20 Sep	Air France
25 Sep - 10 Oct	Air Transat	direct
22 Sep - 01 Oct	Lufthansa
25 Sep - 03 Oct	Air Transat	direct
26 Sep - 04 Oct	SWISS
14 Sep - 18 Sep	Lufthansa
28 Sep - 14 Oct	Air France
10 Sep - 16 Sep	Ryanair
02 Sep - 11 Sep	easyJet

Also check the deals for one-way flights from Basel 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 Basel to Montreal in September from $472

Return flights