Cheapest return flights from Ontario to Las Vegas in September from $76

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

Return flights

03 Sep - 10 Sep Frontier Airlines direct
16 Sep - 23 Sep Frontier Airlines direct
06 Sep - 08 Sep Frontier Airlines direct
22 Sep - 27 Sep Frontier Airlines direct
03 Sep - 14 Sep Frontier Airlines direct
20 Sep - 21 Sep Frontier Airlines direct
17 Sep - 21 Sep Frontier Airlines direct
15 Sep - 16 Sep Southwest Airlines direct
04 Sep - 09 Sep Southwest Airlines direct
18 Sep - 22 Sep Southwest Airlines direct
30 Sep - 07 Oct Southwest Airlines direct
30 Sep - 15 Oct Southwest Airlines direct
30 Sep - 11 Oct Southwest Airlines direct
27 Sep - 01 Oct Southwest Airlines direct
30 Sep - 04 Oct Southwest Airlines direct
14 Sep - 05 Oct Southwest Airlines direct

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.

Book a cheap hotel in Las Vegas

Cheap car rent in Las Vegas

Feel free to contact us with any feedback or request another flight research.