Cheap flights from Las Vegas to Los Angeles from $29

In general, January is the cheapest month to fly from Las Vegas to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $87. If you aren’t able to travel during the month of January, then book flights to Ontario from Las Vegas during February instead. Flights to Ontario in February, while not as cheap as those in January, still average around $94.

The cheapest day to depart on your flight to Ontario is on a Wednesday when prices can be found for as low as $99. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Las Vegas to Ontario for around $142.

In the evening is the cheapest time of day to fly from Las Vegas to Ontario when you can find flight prices for as low as $101. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $121 on average. Flights to Ontario from Las Vegas in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Las Vegas Harry Reid Intl to Ontario for the best Las Vegas Harry Reid Intl - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Las Vegas when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $107 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Las Vegas for as low as $77 on momondo.

There is only 1 cabin class available to choose from on Las Vegas Harry Reid Intl to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier is the most popular carrier operating from Las Vegas Harry Reid Intl to Ontario

Spirit Airlines, Frontier and Southwest are the top three most popular airlines that fly to Ontario from Las Vegas according to our data. Spirit Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

As of February 2026, 4 flights take off from Las Vegas and land in Ontario each day. The most common flight departure time for this route is 8:00AM, with 40% of daily flights taking off in the afternoon.

34 flights are operational weekly from Las Vegas to Ontario as of February 2026. The most popular departure day for this route is Thu, with 26% of flights per week taking off on this day.