Cheap flights from Phoenix to Los Angeles from $57

In general, September is the cheapest month to fly from Phoenix to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $158. If you aren’t able to travel during the month of September, then book flights to Ontario from Phoenix during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $175.

The cheapest day to depart on your flight to Ontario is on a Saturday when prices can be found for as low as $231. 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 Phoenix to Ontario for around $335.

At noon is the cheapest time of day to fly from Phoenix to Ontario when you can find flight prices for as low as $261. Flying to Ontario at noon 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 evening when prices are $296 on average. Flights to Ontario from Phoenix in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Phoenix Sky Harbor Intl to Ontario for the best Phoenix - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Phoenix when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $241 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Phoenix for as low as $120 on momondo.

There are 3 cabin classes available to choose from on Phoenix to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, American Airlines, and Frontier are the most popular carriers operating from Phoenix to Ontario

Frontier, Southwest and American Airlines are the top three most popular airlines that fly to Ontario from Phoenix according to our data. Frontier is the first choice among our users, with 51% 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.

9 flights are operational daily from Phoenix to Ontario as of April 2026. The most popular departure time for this route is 3:00PM, with 41% of flights per day taking off in the afternoon.

As of April 2026, there are 69 flights per week flying from Phoenix to Ontario. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.