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

Return flights

07 Sep - 18 Sep	Air Transat	direct
29 Sep - 06 Oct	FrenchBee
10 Sep - 17 Sep	FrenchBee
09 Sep - 16 Sep	WestJet
28 Sep - 05 Oct	FrenchBee
05 Sep - 11 Sep	Air Transat	direct
18 Sep - 10 Oct	Air Transat
17 Sep - 24 Sep	FrenchBee
15 Sep - 22 Sep	Air Transat
26 Sep - 05 Oct	FrenchBee
30 Sep - 15 Oct	SWISS
26 Sep - 03 Oct	FrenchBee
30 Sep - 07 Oct	SWISS
08 Sep - 15 Sep	FrenchBee
07 Sep - 14 Sep	FrenchBee
24 Sep - 15 Oct	FrenchBee
23 Sep - 14 Oct	WestJet
23 Sep - 30 Sep	WestJet
27 Sep - 11 Oct	Air Transat
21 Sep - 28 Sep	FrenchBee

Also check the deals for one-way flights from Montreal to Basel 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 Montreal to Basel in September from 477€

Return flights