Cheapest return flights from Las Vegas to Ontario in September from $251

AirHint found the following cheapest return flights from Las Vegas (LAS) to Ontario (ONT) in September 2026 (see full year).

Return flights

02 Sep - 02 Sep Southwest Airlines
08 Sep - 10 Sep Southwest Airlines
08 Sep - 13 Sep Southwest Airlines
02 Sep - 22 Sep Southwest Airlines
01 Sep - 03 Sep Southwest Airlines
03 Sep - 07 Sep Southwest Airlines

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

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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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