Cheapest return flights from Ontario to Las Vegas in September from $249

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

29 Sep - 02 Oct Southwest Airlines
26 Sep - 28 Sep Southwest Airlines
19 Sep - 27 Sep Southwest Airlines
21 Sep - 26 Sep Southwest Airlines
02 Sep - 05 Sep Southwest Airlines
20 Sep - 27 Sep Southwest Airlines
15 Sep - 15 Sep Southwest Airlines
16 Sep - 19 Sep Southwest Airlines
17 Sep - 21 Sep Southwest Airlines
09 Sep - 12 Sep Southwest Airlines
14 Sep - 19 Sep 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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