$85 Cheap Flights from Phoenix (PHX) to Ontario (ONT)

View $85 flight on Mon, May 19, 2025Opens in a new window

Popular airlines from Phoenix Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)

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Find available prices by choosing your travel dates.

Cheap Flights from Phoenix to Ontario (PHX-ONT)

Prices were available within the past 7 days and start at $85 for one-way flights and $156 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Aug 22 - Mon, Aug 25
PHX
Phoenix
ONT
Ontario
$156 Roundtrip, found 2 days ago
$156
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Phoenix to Ontario, returning Mon, Aug 25, priced at $156 found 2 days ago
Frontier Airlines
Fri, May 16 - Sun, May 18
PHX
Phoenix
ONT
Ontario
$170 Roundtrip, found 1 hour ago
$170
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, May 16 from Phoenix to Ontario, returning Sun, May 18, priced at $170 found 1 hour ago
Frontier Airlines
Fri, May 9 - Mon, May 19
PHX
Phoenix
ONT
Ontario
$180 Roundtrip, just found
$180
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, May 9 from Phoenix to Ontario, returning Mon, May 19, priced at $180 just found
Frontier Airlines
Sun, May 18 - Tue, May 27
PHX
Phoenix
ONT
Ontario
$181 Roundtrip, found 2 hours ago
$181
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, May 18 from Phoenix to Ontario, returning Tue, May 27, priced at $181 found 2 hours ago
Frontier Airlines
Thu, May 15 - Wed, May 21
PHX
Phoenix
ONT
Ontario
$187 Roundtrip, found 9 hours ago
$187
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Thu, May 15 from Phoenix to Ontario, returning Wed, May 21, priced at $187 found 9 hours ago
Frontier Airlines
Mon, May 19 - Thu, May 29
PHX
Phoenix
ONT
Ontario
$190 Roundtrip, just found
$190
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, May 19 from Phoenix to Ontario, returning Thu, May 29, priced at $190 just found
Frontier Airlines
Wed, Jun 11 - Sat, Jun 21
PHX
Phoenix
ONT
Ontario
$191 Roundtrip, just found
$191
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Jun 11 from Phoenix to Ontario, returning Sat, Jun 21, priced at $191 just found
American Airlines
Wed, May 28 - Sat, Jun 7
PHX
Phoenix
ONT
Ontario
$194 Roundtrip, just found
$194
Roundtrip
just found
Select American Airlines flight, departing Wed, May 28 from Phoenix to Ontario, returning Sat, Jun 7, priced at $194 just found
Southwest Airlines
Thu, May 22 - Sat, May 31
PHX
Phoenix
ONT
Ontario
$196 Roundtrip, found 2 hours ago
$196
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Thu, May 22 from Phoenix to Ontario, returning Sat, May 31, priced at $196 found 2 hours ago
Alaska Airlines
Mon, May 12 - Wed, May 14
PHX
Phoenix
ONT
Ontario
$372 Roundtrip, found 4 hours ago
$372
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Mon, May 12 from Phoenix to Ontario, returning Wed, May 14, priced at $372 found 4 hours ago
Flights from Phoenix (PHX) to Ontario (ONT)
Origin airport
Sky Harbor Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$91
Distance
323 mi

Phoenix to Ontario Flights

The cheapest times to fly from Phoenix to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Phoenix to Ontario are during the month of August. You can find some of the cheapest flights from Phoenix to Ontario with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Phoenix to Ontario

Sunday is one of the best days to book for cheap flights from Phoenix to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Phoenix to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Phoenix to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $85 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Phoenix to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Phoenix to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Snag cheap return flights starting from $83 from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines and Frontier Airlines flight leaving PHX on May 15 2025 and touching down at ONT. The price was last updated on April 23 2025 and has not changed since.
What is the cheapest month to fly from PHX to ONT?
The cheapest flights from PHX to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
Board a direct flight with American Airlines and journey straight from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT).
What is the cheapest airline that flies from PHX to ONT?
With tickets starting at $49 for a one-way journey from PHX to ONT, American Airlines is currently the cheapest airline operating this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from PHX on June 11 2025. Prices were last updated on April 23 2025 and have not changed since.
How many flights per day from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
When flying out of Sky Harbor Intl. Airport (PHX), you’ll have a choice from an average of 8 daily direct flights to Los Angeles - Ontario Intl. Airport (ONT).
What are the most popular departure times for flights from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
More people fly between PHX and ONT at 8 AM than at any other point in the day. Looking to skip the crowds? Pick a flight outside the busiest times and you’re likely to save on your ticket as well.
What day of the week has the most flights from PHX to ONT?
Sunday offers the most flights from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT). Consider jetting off on this day and you’ll have the best chance of finding a schedule that works for you.
What is the earliest flight from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
Hop on the earliest flight at around 8:40AM UTC-7, leaving from Sky Harbor Intl. Airport (PHX). You’ll be traveling for roughly 1h 29m, coming in to land at Los Angeles - Ontario Intl. Airport (ONT) at approximately 9:09AM UTC-8.
How long does it take to fly from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
It takes roughly 1 hour and 24 minutes to cover the 320 mi from PHX to ONT.
What airline has the least delays from PHX to ONT?
With 80% of journeys generally landing on time, American Airlines has the best on-time performance for nonstop flights from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT). To check your flight status and get notifications about any changes, simply head to the Expedia App.
What is the best time to fly from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
To land at Los Angeles - Ontario Intl. Airport (ONT) on time, opt for a flight that leaves from Sky Harbor Intl. Airport (PHX) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Ontario from Sky Harbor Intl. Airport (PHX)?
A direct flight from Sky Harbor Intl. Airport (PHX) will take you straight to one of these hubs in Ontario:

  • Los Angeles Intl. Airport (LAX)
  • John Wayne Airport (SNA)
  • Bob Hope Airport (BUR)
  • Los Angeles - Ontario Intl. Airport (ONT)
  • Long Beach Municipal Airport (LGB)

Is it cheaper to buy a plane ticket from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until just before your departure to book a flight from PHX to ONT generally means paying more. While you may come across some last-minute deals, there’s no guarantee. Allow some flexibility in your schedule for a better chance of scoring a bargain.
Is it cheaper to book a PHX to ONT flight and hotel package?
You’ll typically save money by booking a PHX to ONT flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s simple to manage everything in one convenient place. Once you’ve selected your ideal accommodations and flights, consider other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Sky Harbor Intl. Airport (PHX) to Los Angeles - Ontario Intl. Airport (ONT)?
It’s usually possible to reschedule or cancel your PHX to ONT flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find further details on our Customer Service portal.

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