Cheapest return flights from Ontario to Las Vegas in September from $250

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

Return flights

21 Sep - 24 Sep Southwest Airlines
17 Sep - 21 Sep Southwest Airlines
22 Sep - 24 Sep Southwest Airlines
19 Sep - 26 Sep Southwest Airlines
12 Sep - 13 Sep Southwest Airlines
18 Sep - 26 Sep Southwest Airlines
19 Sep - 19 Sep Southwest Airlines

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

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