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

Return flights

22 Sep - 13 Oct	TAP
10 Sep - 01 Oct	TAP
29 Sep - 13 Oct	TAP
11 Sep - 18 Sep	TAP
10 Sep - 17 Sep	TAP
22 Sep - 29 Sep	TAP
29 Sep - 14 Oct	TAP
14 Sep - 21 Sep	TAP
14 Sep - 28 Sep	TAP
15 Sep - 30 Sep	Air Transat	direct
03 Sep - 09 Sep	Air Transat	direct
27 Sep - 25 Oct	Air Transat	direct
07 Sep - 11 Sep	Air Transat	direct
29 Sep - 06 Oct	Air Transat	direct
30 Sep - 07 Oct	Air Transat	direct
15 Sep - 22 Sep	TAP
12 Sep - 29 Sep	TAP
29 Sep - 14 Oct	Air Transat	direct
23 Sep - 11 Oct	Air Transat	direct
24 Sep - 01 Oct	TAP

Also check the deals for one-way flights from Montreal to Lyon 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 Lyon in September from $482

Return flights