Cheapest return flights from Las Vegas to Ontario in September from $122

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

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

Return flights

02 Sep - 09 Sep Frontier Airlines direct
03 Sep - 24 Sep Southwest Airlines direct
03 Sep - 09 Sep Southwest Airlines direct
06 Sep - 13 Sep Southwest Airlines direct
24 Sep - 24 Sep Southwest Airlines
19 Sep - 23 Sep Southwest Airlines
15 Sep - 19 Sep Southwest Airlines
01 Sep - 08 Sep Southwest Airlines
18 Sep - 19 Sep Southwest Airlines
07 Sep - 08 Sep Southwest Airlines

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