Cheapest return flights from Ontario to Las Vegas in September from $96

Best time to book flights for Ontario (ONT) to Las Vegas (LAS) flights at AirHint

AirHint found the following cheapest return flights from Ontario (ONT) to Las Vegas (LAS) in September 2025 (see full year).

Return flights

22 Sep - 24 Sep Southwest Airlines
09 Sep - 17 Sep Southwest Airlines
07 Sep - 10 Sep Southwest Airlines
07 Sep - 09 Sep Southwest Airlines
15 Sep - 19 Sep Southwest Airlines
11 Sep - 18 Sep Southwest Airlines
10 Sep - 13 Sep Southwest Airlines
16 Sep - 20 Sep Southwest Airlines
01 Sep - 09 Sep Southwest Airlines
16 Sep - 21 Sep Southwest Airlines
19 Sep - 02 Oct Southwest Airlines

Also check the deals for one-way flights from Ontario to Las Vegas in September.

Skyscanner

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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