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

Return flights

19 Sep - 25 Sep	Air Transat	direct
17 Sep - 25 Sep	Air Transat	direct
29 Sep - 06 Oct	Air Transat
30 Sep - 07 Oct	WestJet
28 Sep - 05 Oct	FrenchBee
25 Sep - 02 Oct	Air Transat
30 Sep - 10 Oct	WestJet
24 Sep - 01 Oct	FrenchBee
23 Sep - 30 Sep	WestJet
24 Sep - 04 Oct	Air Transat
27 Sep - 04 Oct	Air Transat
24 Sep - 04 Oct	Air Transat	direct
18 Sep - 25 Sep	Air Transat
22 Sep - 29 Sep	FrenchBee
21 Sep - 28 Sep	FrenchBee
26 Sep - 03 Oct	FrenchBee
19 Sep - 26 Sep	Air Transat
20 Sep - 27 Sep	Air Transat

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 583€

Return flights