$49 Cheap Flights from Ontario (ONT) to Phoenix (PHX)

View $49 flight on Mon, Dec 8, 2025Opens in a new window

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

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Today's featured flight deals from Los Angeles - Ontario Intl. Airport (ONT) to Phoenix Sky Harbor Intl. Airport (PHX)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Ontario to Phoenix (ONT-PHX)

Prices were available within the past 7 days and start at $49 for one-way flights and $97 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Sep 11 - Mon, Sep 15
ONT
Ontario
PHX
Phoenix
$97 Roundtrip, just found
$97
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Sep 11 from Ontario to Phoenix, returning Mon, Sep 15, priced at $97 just found
American Airlines
Thu, Sep 11 - Mon, Sep 15
ONT
Ontario
PHX
Phoenix
$97 Roundtrip, just found
$97
Roundtrip
just found
Select American Airlines flight, departing Thu, Sep 11 from Ontario to Phoenix, returning Mon, Sep 15, priced at $97 just found
Southwest Airlines
Tue, Oct 28 - Wed, Oct 29
ONT
Ontario
PHX
Phoenix
$117 Roundtrip, found 10 hours ago
$117
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Ontario to Phoenix, returning Wed, Oct 29, priced at $117 found 10 hours ago
Southwest Airlines
Tue, Oct 28 - Wed, Oct 29
ONT
Ontario
PHX
Phoenix
$122 Roundtrip, found 10 hours ago
$122
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Ontario to Phoenix, returning Wed, Oct 29, priced at $122 found 10 hours ago
Southwest Airlines
Thu, Nov 13 - Sun, Nov 16
ONT
Ontario
PHX
Phoenix
$124 Roundtrip, just found
$124
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Nov 13 from Ontario to Phoenix, returning Sun, Nov 16, priced at $124 just found
Southwest Airlines
Tue, Oct 28 - Wed, Oct 29
ONT
Ontario
PHX
Phoenix
$127 Roundtrip, found 10 hours ago
$127
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Ontario to Phoenix, returning Wed, Oct 29, priced at $127 found 10 hours ago
American Airlines
Thu, Sep 11 - Mon, Sep 15
ONT
Ontario
PHX
Phoenix
$127 Roundtrip, just found
$127
Roundtrip
just found
Select American Airlines flight, departing Thu, Sep 11 from Ontario to Phoenix, returning Mon, Sep 15, priced at $127 just found
Frontier Airlines
Sat, Aug 30 - Thu, Sep 4
ONT
Ontario
PHX
Phoenix
$133 Roundtrip, found 1 hour ago
$133
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Aug 30 from Ontario to Phoenix, returning Thu, Sep 4, priced at $133 found 1 hour ago
United
Fri, Sep 12 - Mon, Sep 15
ONT
Ontario
PHX
Phoenix
$299 Roundtrip, just found
$299
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Ontario to Phoenix, returning Mon, Sep 15, priced at $299 just found
Alaska Airlines
Sat, Oct 18 - Wed, Oct 22
ONT
Ontario
PHX
Phoenix
$363 Roundtrip, found 3 hours ago
$363
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Oct 18 from Ontario to Phoenix, returning Wed, Oct 22, priced at $363 found 3 hours ago

Find the cheapest month to fly from Ontario (ONT) to Phoenix (PHX)

October is typically the cheapest month to fly

From $53 - $151 per traveler.

Graph displaying average flight prices per month

Alternative airports near Phoenix

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sky Harbor Intl. PHX. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $178
PHX
Sky Harbor Intl.
CheapestClosest
Average driving time to city center10 min
Flights from $178
Flights from Ontario (ONT) to Phoenix (PHX)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Sky Harbor Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$97
Distance
323 mi
Average flight time
1 hour 16 mins

Ontario to Phoenix Flights

The cheapest times to fly from Ontario to Phoenix

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 Ontario to Phoenix are during the month of September. You can find some of the cheapest flights from Ontario to Phoenix with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Phoenix

Sunday is one of the best days to book for cheap flights from Ontario to Phoenix: 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 Ontario to Phoenix

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 Ontario to Phoenix in 2025. You can also book with separate airlines for your outbound and return journeys, from $49 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 Ontario to Phoenix 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 Ontario to Phoenix 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 Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX) cost?
You can score affordable return tickets from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX) starting at $77. Grab your seat and start your adventure. 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 flight leaving ONT on August 19 2025 and touching down at PHX. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from ONT to PHX?
The cheapest flights from ONT to PHX 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 Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
Hop on a nonstop flight with American Airlines and fly straight from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX).
What is the cheapest airline that flies from ONT to PHX?
Journey from ONT to PHX with Southwest Airlines. This carrier currently has the lowest one-way fare on this route, starting at $39. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ONT on October 18 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
Every day on average, 8 nonstop flights take off from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX). Select the departure time that fits your schedule best.
What are the most popular departure times for flights from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
More passengers fly between ONT and PHX at 6 AM than at any other time. Looking to skip the crowds? Try choosing a quieter departure window and there's a chance you'll save on your ticket as well.
What day of the week has the most flights from ONT to PHX?
Jet off on a Thursday if you're after the best choice of flights from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX).
What is the earliest flight from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
The earliest flight taking off from Los Angeles - Ontario Intl. Airport (ONT) is at around 5:00AM UTC-8. Catch this flight and you'll land at Sky Harbor Intl. Airport (PHX) at approximately 7:10AM UTC-7. The total flight duration is 1h 10m.
How long does it take to fly from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
Flights from ONT to PHX have an average travel time of 1 hour and 19 minutes. The total distance between the two is 320 mi.
What airline has the least delays from ONT to PHX?
Consider booking with Southwest Airlines if you'd like to go straight from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX) without any interruptions. This carrier has the best track record for punctuality, with an on-time performance of 83%. Want to be updated if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
Opt for a flight from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Phoenix from Los Angeles - Ontario Intl. Airport (ONT)?
Sky Harbor Intl. Airport (PHX) is the only airport in Phoenix with direct flights from Los Angeles - Ontario Intl. Airport (ONT). Consider the options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX) last-minute?
Waiting until just before your departure to book your flight from ONT to PHX generally means paying more. While it's possible to find some last-minute discounts, there's no guarantee. Keep your travel plans flexible for a better chance of getting a bargain.
Is it cheaper to book an ONT to PHX flight and hotel package?
Booking an ONT to PHX flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our wide range of hotels and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Sky Harbor Intl. Airport (PHX)?
Typically, you can cancel or reschedule your ONT to PHX flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you need more information, go to our Customer Service portal.

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*Available to One Key members.