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

Return flights

09 Sep - 11 Sep	Porter Airlines (Canada) Ltd
23 Sep - 23 Sep	Porter Airlines (Canada) Ltd
03 Sep - 10 Sep	WestJet
15 Sep - 23 Sep	WestJet
09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
09 Sep - 23 Sep	WestJet
10 Sep - 21 Sep	WestJet
17 Sep - 01 Oct	WestJet
16 Sep - 07 Oct	WestJet
17 Sep - 08 Oct	WestJet
02 Sep - 16 Sep	Porter Airlines (Canada) Ltd
12 Sep - 15 Sep	WestJet
22 Sep - 01 Oct	WestJet
16 Sep - 30 Sep	WestJet
15 Sep - 12 Oct	WestJet
16 Sep - 10 Oct	WestJet
26 Sep - 04 Oct	WestJet
23 Sep - 14 Oct	WestJet
23 Sep - 09 Oct	WestJet
23 Sep - 15 Oct	WestJet

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

Return flights