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

Return flights

04 Sep - 07 Sep	KLM
04 Sep - 08 Sep	KLM
04 Sep - 17 Sep	Air Transat	direct
08 Sep - 15 Sep	Air Dolomiti
06 Sep - 10 Sep	Air Dolomiti
19 Sep - 05 Oct	Lufthansa
29 Sep - 12 Oct	Lufthansa
19 Sep - 12 Oct	Lufthansa
14 Sep - 05 Oct	SWISS
15 Sep - 06 Oct	SWISS
15 Sep - 07 Oct	SWISS
15 Sep - 08 Oct	SWISS
15 Sep - 11 Oct	SWISS
15 Sep - 12 Oct	SWISS
15 Sep - 05 Oct	Lufthansa
04 Sep - 07 Sep	Air Transat	direct
01 Sep - 17 Sep	Lufthansa
06 Sep - 13 Sep	Lufthansa
01 Sep - 17 Sep	Air Transat	direct
01 Sep - 07 Sep	Air Transat	direct

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 413€

Return flights