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

Return flights

18 Apr - 25 Apr	Southwest Airlines
03 Apr - 25 Apr	Southwest Airlines
05 Apr - 09 Apr	Southwest Airlines
12 Apr - 30 Apr	Southwest Airlines	direct
28 Apr - 03 May	Southwest Airlines
11 Apr - 12 Apr	Southwest Airlines

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

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

Return flights