Cheapest return flights from Las Vegas to Ontario in May from $111

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

Return flights

18 May - 20 May Frontier Airlines direct
05 May - 12 May Frontier Airlines direct
13 May - 19 May Southwest Airlines
16 May - 16 May Southwest Airlines
16 May - 17 May Southwest Airlines direct
08 May - 15 May Southwest Airlines
23 May - 30 May Southwest Airlines
21 May - 24 May Southwest Airlines
22 May - 29 May Southwest Airlines
30 May - 06 Jun Southwest Airlines

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

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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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