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Sky Harbor Intl

$39+ Cheap flights from Ontario (ONT) to Sky Harbor Intl (PHX)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Phoenix Sky Harbor Intl are usually found in August or September, booked 75 days in advance, depart on a Wednesday or Friday and return on a Saturday

Cheap flight deals from Ontario to Sky Harbor Intl

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Sky Harbor Intl (PHX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$114
(Southwest)

One-way from

$39
(Southwest)

Popular in

July

Cheapest in

August

Average price

$198

Good round-trip deal

$288 or less

Good one-way deal

$140 or less
From Ontario to Phoenix Sky Harbor Intl
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One-way flight from Ontario to Phoenix Sky Harbor Intl
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Highest demand for flights based on searches. 1% potential increase in price ($4 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Ontario to Phoenix Sky Harbor Intl.
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Price to beat on a one-way flight from Ontario to Phoenix Sky Harbor Intl.
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Find flight deals from Ontario to Sky Harbor Intl

Cheapest flights from Ontario to Sky Harbor Intl
Explore the most affordable flight options available from Ontario to Sky Harbor Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/125:20 amONT - PHX
Nonstop1h 10mSouthwest
Mon 9/153:20 pmPHX - ONT
Nonstop1h 10mSouthwest
Deal found 8/13$114
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/264:45 pmONT - PHX
Nonstop1h 27mAmerican Airlines
Sat 9/278:04 amPHX - ONT
Nonstop1h 17mAmerican Airlines
Deal found 8/12$121
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/136:10 amONT - PHX
Nonstop1h 17mAmerican Airlines
Sun 10/127:41 amPHX - ONT
Nonstop1h 15mAmerican Airlines
Deal found 8/13$123
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/125:20 amONT - PHX
Nonstop1h 10mSouthwest
Sat 9/1312:35 pmPHX - ONT
1 stop4h 45mSouthwest
Deal found 8/13$124
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/95:45 amONT - PHX
1 stop3h 05mSouthwest
Fri 9/126:00 amPHX - ONT
1 stop6h 00mSouthwest
Deal found 8/14$134
This Gotogate deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/215:38 pmONT - PHX
1 stop6h 27mFrontier
Thu 8/285:30 amPHX - ONT
1 stop6h 01mFrontier
Deal found 8/14$143
This Mytrip deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/312:59 amONT - PHX
1 stop6h 33mFrontier
Sun 9/77:55 amPHX - ONT
1 stop15h 43mFrontier
Deal found 8/14$148
This Mytrip deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/312:59 amONT - PHX
1 stop6h 33mFrontier
Mon 9/87:55 amPHX - ONT
1 stop15h 43mFrontier
Deal found 8/14$149
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/264:45 pmONT - PHX
Nonstop1h 27mAmerican Airlines
Sun 9/2810:32 amPHX - ONT
Nonstop1h 24mAmerican Airlines
Deal found 8/12$151

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Sky Harbor Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Ontario to Phoenix Sky Harbor Intl Airport that are best for you.

Fly from

Ontario

Fly to

Sky Harbor Intl

Route

Depart

Return

Price

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 9/12

5:20 am-6:30 am

Nonstop1h 10m

Phoenix Sky Harbor Intl

Mon 9/15

3:20 pm-4:30 pm

Nonstop1h 10m

$114

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 9/12

5:20 am-6:30 am

Nonstop1h 10m

Phoenix Sky Harbor Intl

Sat 9/13

7:30 pm-8:40 pm

Nonstop1h 10m

$114

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 9/9

7:10 pm-8:25 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Fri 9/12

8:00 am-9:10 am

Nonstop1h 10m

$114

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sun 10/5

8:00 pm-9:20 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Wed 10/8

8:55 pm-10:05 pm

Nonstop1h 10m

$114

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 9/26

5:20 am-6:30 am

Nonstop1h 10m

Phoenix Sky Harbor Intl

Mon 9/29

3:20 pm-4:30 pm

Nonstop1h 10m

$114

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 11/10

12:55 pm-3:18 pm

Nonstop1h 23m

Phoenix Sky Harbor Intl

Fri 11/14

8:35 am-8:55 am

Nonstop1h 20m

$121

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 9/15

4:45 pm-6:12 pm

Nonstop1h 27m

Phoenix Sky Harbor Intl

Fri 9/19

4:58 pm-6:16 pm

Nonstop1h 18m

$121

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 9/11

7:16 pm-8:35 pm

Nonstop1h 19m

Phoenix Sky Harbor Intl

Sun 9/14

4:58 pm-6:12 pm

Nonstop1h 14m

$121

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 11/8

4:47 pm-7:08 pm

Nonstop1h 21m

Phoenix Sky Harbor Intl

Sun 11/9

8:35 am-8:55 am

Nonstop1h 20m

$121

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 10/10

4:49 pm-6:07 pm

Nonstop1h 18m

Phoenix Sky Harbor Intl

Mon 10/13

8:03 am-9:19 am

Nonstop1h 16m

$121

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 18 results
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The best insider tips for Ontario to Phoenix Sky Harbor Intl Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Phoenix Sky Harbor Intl Airport trip
Airlines
Southwest

Southwest offers two free checked bags, including oversized items like skis or golf clubs.


Enjoy free in-flight entertainment with early-release movies and live TV on Southwest flights.

Read more about Southwestby Marisa Garcia
Frontier

Frontier's UpFront Plus seats guarantee an empty middle seat for extra comfort.


Frontier offers no in-flight entertainment or Wi-Fi; bring your own entertainment.

Read more about Frontierby Marisa Garcia
Airports
ONT

ONT offers quick security checks at both terminals, making it a convenient choice for domestic flights.

Read more about ONTby Bill Fink
PHX

For a quick commute to downtown Phoenix, take the free PHX Sky Train to 44th Street Station, then the light rail.

Read more about PHXby Brandon Schultz
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Southwest and Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Brandon Schultz

Brandon Schultz

Expert on PHX

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more

Best time to book a flight from Ontario to Sky Harbor Intl

Have a flexible travel schedule? Discover the best time to fly to Sky Harbor Intl from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Phoenix Sky Harbor Intl Airport

How far ahead should I book a flight from Ontario to Phoenix Sky Harbor Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Sky Harbor Intl. Price data was last updated on August 8, 2025.

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Phoenix Sky Harbor Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario to Phoenix Sky Harbor Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Ontario to Phoenix Sky Harbor Intl Airport (average of $258). Flying from Ontario to Phoenix Sky Harbor Intl Airport in March is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to PHX?

Find hourly flight availability from Ontario to Sky Harbor Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

It’s optimal to fly from Ontario to Phoenix Sky Harbor Intl Airport at noon. By choosing this option you can save up to 7% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Ontario to Phoenix Sky Harbor Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Sky Harbor Intl. Price data was last updated on August 10, 2025.

Travelers seeking maximum savings on their Ontario to Phoenix Sky Harbor Intl Airport flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to Phoenix Sky Harbor Intl Airport

Explore weekly flight availability from Ontario to Sky Harbor Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 14, 2025.

The most flights from ONT to PHX are scheduled on a Thursday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

Reviews of airlines servicing Sky Harbor Intl

Get insights into the airlines that provide service to Sky Harbor Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sky Harbor Intl. Reviews last updated August 14, 2025.
Read through reviews of airlines operating flights from Ontario to Phoenix Sky Harbor Intl Airport, such as Southwest, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,219 reviews
Southwest
8.0
Very good
4,244 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Sky Harbor Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Phoenix Sky Harbor Intl?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Phoenix Sky Harbor Intl from Ontario. Booking flights from Ontario (ONT) to Phoenix Sky Harbor Intl should be relatively easy as there are 8 daily outbound flights to Phoenix Sky Harbor Intl from 3 different airlines.

  • What are the cheapest airlines flying from Ontario to Phoenix Sky Harbor Intl Airport round-trip?

    Currently priced at $55, Frontier will fly you from Ontario to Phoenix Sky Harbor Intl Airport and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and American Airlines - these airlines can fly you to your destination from $110 and $133, respectively. Frontier is 78% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most reliable airlines from Ontario to Phoenix Sky Harbor Intl Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ontario to Phoenix Sky Harbor Intl Airport on time: SkyWest Airlines (90%), British Airways (90%), Southwest (74%).

  • What are the cheapest flights from Ontario to Phoenix Sky Harbor Intl Airport?

    On average you can expect to pay $613 for a flight from Ontario to Phoenix Sky Harbor Intl Airport. The cheapest flight overall is $48 while the most popular route, (Ontario - Phoenix Sky Harbor Intl) is currently priced at $77.

  • Can I find deals for flights from Ontario to Sky Harbor Intl that include hotel bookings?

    Yes. In addition to deals on Ontario to Sky Harbor Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Sky Harbor Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Sky Harbor Intl.

  • Can I find deals for business class flights from Ontario to Sky Harbor Intl?

    Yes. Cheapflights offers flight deals from Ontario to Sky Harbor Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Phoenix Sky Harbor Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Phoenix Sky Harbor Intl Airport (average of $258). Flying from Ontario to Phoenix Sky Harbor Intl Airport in March is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Phoenix Sky Harbor Intl Airport?

Book flights to Phoenix Sky Harbor Intl Airport if you plan to visit one of these locations
Payson
Chandler
Glendale
Globe
Goodyear
Surprise
Casa Grande
Buckeye
Camp Verde
Peoria
Paradise Valley
Avondale
Guadalupe

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Alternative routes for Ontario to Sky Harbor Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ontario to Sky Harbor Intl

Discover the top 3 airlines that operate flights from Ontario to Sky Harbor Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$158FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$110Average$256FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$133Average$291FlexibilityNo cancel feeOn-time71%

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