AirHint found the following cheapest return flights from Montreal (YUL) to Basel (BSL) in September 2026 (see full year).

Return flights

14 Sep - 21 Sep	Air Transat
29 Sep - 06 Oct	Air Transat
21 Sep - 28 Sep	Air Transat
08 Sep - 15 Sep	Air Transat
07 Sep - 14 Sep	Air Transat
22 Sep - 29 Sep	Air Transat
13 Sep - 20 Sep	Air Transat
01 Sep - 08 Sep	Air Transat
28 Sep - 05 Oct	Air Transat
30 Sep - 07 Oct	Air Canada
23 Sep - 30 Sep	Air Canada
15 Sep - 22 Sep	Air Transat
26 Sep - 03 Oct	Air Transat
12 Sep - 19 Sep	Air Transat
27 Sep - 24 Oct	Air Transat	direct
27 Sep - 04 Oct	Air Transat
25 Sep - 02 Oct	Air Transat
24 Sep - 01 Oct	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 $735

Return flights