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

Return flights

30 Sep - 07 Oct	WestJet
30 Sep - 14 Oct	WestJet
30 Sep - 21 Oct	WestJet
30 Sep - 05 Oct	WestJet
30 Sep - 07 Oct	Air Canada	direct
30 Sep - 08 Oct	Air Canada	direct
30 Sep - 05 Oct	Air Canada	direct
30 Sep - 14 Oct	Air Canada	direct
30 Sep - 21 Oct	Air Canada	direct
30 Sep - 16 Oct	Air Canada	direct
23 Sep - 30 Sep	WestJet
23 Sep - 28 Sep	WestJet
22 Sep - 29 Sep	WestJet
23 Sep - 30 Sep	Air Canada	direct
28 Sep - 30 Sep	Air Canada	direct
24 Sep - 30 Sep	United
20 Sep - 23 Sep	Air Transat
23 Sep - 25 Sep	Porter Airlines (Canada) Ltd
24 Sep - 25 Sep	Porter Airlines (Canada) Ltd
26 Sep - 28 Sep	Air Canada	direct

Also check the deals for one-way flights from Montreal to Los Angeles 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 Los Angeles in September from $187

Return flights