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$57+ Cheap flights from Sky Harbor Intl (PHX) to Ontario (ONT)

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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Find cheap flights from Sky Harbor Intl to Ontario with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Phoenix Sky Harbor Intl to Ontario are usually found in September or August, booked 85 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Sky Harbor Intl to Ontario

Cheapest flights from Sky Harbor Intl to Ontario
Explore the most affordable flight options available from Sky Harbor Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 9, 2025.

This Mytrip deal was found by Cheapflights users on 12/7. 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.
Sun 12/2810:26 pmPHX - ONT
1 stop23h 51mFrontier
Mon 2/23:22 pmONT - PHX
1 stop3h 45mFrontier
Deal found 12/7$152
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:26 pmPHX - ONT
1 stop19h 56mFrontier
Thu 1/1510:18 pmONT - PHX
1 stop9h 02mFrontier
Deal found 12/8$157
This Frontier deal was found by Cheapflights users on 12/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop8h 24mFrontier
Sat 12/276:00 amONT - PHX
1 stop3h 40mFrontier
Deal found 12/7$163
This Gotogate deal was found by Cheapflights users on 12/6. 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.
Mon 12/2910:26 pmPHX - ONT
1 stop19h 56mFrontier
Wed 1/710:45 amONT - PHX
1 stop4h 39mFrontier
Deal found 12/6$168
This Gotogate deal was found by Cheapflights users on 12/7. 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.
Wed 12/319:31 amPHX - ONT
1 stop15h 28mFrontier
Wed 1/710:45 amONT - PHX
1 stop4h 39mFrontier
Deal found 12/7$169
This Super.com deal was found by Cheapflights users on 12/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop8h 24mFrontier
Mon 12/296:00 pmONT - PHX
1 stop13h 48mFrontier
Deal found 12/6$170
This Gotogate deal was found by Cheapflights users on 12/8. 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.
Mon 12/229:58 amPHX - ONT
1 stop12h 19mFrontier
Wed 12/246:00 amONT - PHX
1 stop14h 16mFrontier
Deal found 12/8$172
This Mytrip deal was found by Cheapflights users on 12/7. 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 12/319:31 amPHX - ONT
1 stop15h 28mFrontier
Sun 1/46:37 pmONT - PHX
1 stop13h 11mFrontier
Deal found 12/7$173
This Mytrip deal was found by Cheapflights users on 12/7. 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.
Tue 12/239:58 amPHX - ONT
1 stop8h 24mFrontier
Tue 12/306:17 pmONT - PHX
1 stop25h 59mFrontier
Deal found 12/7$174
This CheapOair deal was found by Cheapflights users on 12/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:26 pmPHX - ONT
1 stop19h 56mFrontier
Tue 12/306:17 pmONT - PHX
1 stop25h 59mFrontier
Deal found 12/7$175
This CheapOair deal was found by Cheapflights users on 12/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop12h 19mFrontier
Fri 12/266:45 amONT - PHX
1 stop16h 44mFrontier
Deal found 12/7$176

Find flight deals from Sky Harbor Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Sky Harbor Intl (PHX) to Ontario (ONT). 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 December 9, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$110
(Kiwi.com)

One-way from

$57
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$305

Good round-trip deal

$255 or less

Good one-way deal

$175 or less
Provider with most accurate pricing for Phoenix Sky Harbor Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Phoenix Sky Harbor Intl-Ontario flights.
Search Deals
From Phoenix Sky Harbor Intl to Ontario
Search Deals
One-way flight from Phoenix Sky Harbor Intl to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Phoenix Sky Harbor Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Phoenix Sky Harbor Intl to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sky Harbor Intl to Ontario 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 December 9, 2025.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to Ontario that are best for you.

Fly from

Sky Harbor Intl

Fly to

Ontario

Route

Depart

Return

Price

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 1/31

1:00 pm-11:24 pm

1 stop11h 24m

Ontario

Sun 2/1

5:21 pm-8:20 am

1 stop13h 59m

$118

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 1/24

3:55 pm-11:24 pm

1 stop8h 29m

Ontario

Sun 1/25

2:48 pm-8:20 am

1 stop16h 32m

$118

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 3/2

6:54 pm-9:17 pm

1 stop3h 23m

Ontario

Tue 3/10

6:00 am-2:07 pm

1 stop8h 07m

$145

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 1/24

2:06 pm-6:40 pm

1 stop5h 34m

Ontario

Mon 1/26

8:05 pm-2:22 pm

2 stops17h 17m

$161

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 1/7

4:41 pm-11:14 pm

1 stop7h 33m

Ontario

Wed 1/14

7:15 am-3:15 pm

1 stop7h 00m

$162

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 12/24

10:26 pm-5:22 pm

1 stop19h 56m

Ontario

Sat 12/27

6:00 am-10:40 am

1 stop3h 40m

$170

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 12/20

7:00 am-11:13 pm

1 stop17h 13m

Ontario

Tue 12/23

6:00 am-9:16 pm

1 stop14h 16m

$172

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 12/31

7:00 am-11:59 pm

1 stop17h 59m

Ontario

Thu 1/1

6:07 pm-8:48 am

1 stop13h 41m

$176

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 1/10

12:50 pm-4:25 pm

1 stop4h 35m

Ontario

Mon 1/12

5:45 pm-8:00 pm

Nonstop1h 15m

$181

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 1/24

11:05 am-11:25 am

Nonstop1h 20m

Ontario

Mon 1/26

10:00 am-3:05 pm

1 stop4h 05m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 23 results
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Compare providers for flights from Sky Harbor Intl to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Sky Harbor Intl to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Phoenix Sky Harbor Intl Airport-Ontario flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Phoenix Sky Harbor Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Phoenix Sky Harbor Intl Airport-Ontario flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Phoenix Sky Harbor Intl Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Have a flexible travel schedule? Discover the best time to fly to Ontario from Sky Harbor Intl 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 Phoenix Sky Harbor Intl Airport to Ontario

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

Use this chart to determine the optimal time to book a round-trip flight from Sky Harbor Intl to Ontario. Price data was last updated on December 5, 2025.

The best time to book flights from Phoenix Sky Harbor Intl Airport to Ontario is 85 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Ontario (average of $29). Flying from Phoenix Sky Harbor Intl Airport to Ontario in July is currently the most expensive (average of $79). 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 PHX to ONT?

Find hourly flight availability from Sky Harbor Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 9, 2025.

When flying from Phoenix Sky Harbor Intl Airport to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 11% versus a flight in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to Ontario. Price data was last updated on December 6, 2025.

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

The best insider tips for Phoenix Sky Harbor Intl Airport to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Phoenix Sky Harbor Intl Airport to Ontario trip
Airports
PHX

PHX offers short security lines; expect waits under 10 minutes, even without TSA PreCheck.

Read more about PHXBy Brandon Schultz
ONT

ONT is a convenient alternative to LAX, especially for destinations like Pasadena and Palm Springs.

Read more about ONTBy Bill Fink
Our travel experts
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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated December 9, 2025.
Read through reviews of airlines operating flights from Phoenix Sky Harbor Intl Airport to Ontario, 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
7.9
Good
4,252 reviews

Comfort

8.0

Overall

7.9

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

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
7.9
Good
4,252 reviews
Southwest
7.9
Good
4,252 reviews

Comfort

8.0

Overall

7.9

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

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
11,043 reviews
Southwest
7.9
Good
4,252 reviews

Comfort

8.0

Overall

7.9

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

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
3,085 reviews
Southwest
7.9
Good
4,252 reviews

Comfort

8.0

Overall

7.9

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

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 Sky Harbor Intl to Ontario. 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 into for flights to Ontario from Phoenix Sky Harbor Intl?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from Phoenix Sky Harbor Intl to Ontario. 3 airlines have flights to Ontario from Phoenix Sky Harbor Intl on a regular basis. Booking flights from Phoenix Sky Harbor Intl to Ontario should not be difficult; the airport handles an average of 8 inbound flights from Phoenix Sky Harbor Intl per day.

  • How long is the flight from Phoenix Sky Harbor Intl Airport to Ontario?

    For as low as $118, Frontier can have you in Ontario from Phoenix Sky Harbor Intl Airport in 11h 24m. Phoenix Sky Harbor Intl Airport and Ontario are separated by a distance of 324 mi.

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

    Currently priced at $58, Frontier will fly you from Phoenix Sky Harbor Intl Airport to Ontario and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Southwest - these airlines can fly you to your destination from $97 and $97, respectively. Frontier is priced at 75% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Phoenix Sky Harbor Intl Airport to Ontario one-way?

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $48. Users have also found prices from $54 and $63 on Frontier and American Airlines, respectively.

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

    Before booking your flight to Ontario from Phoenix Sky Harbor Intl Airport, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), British Airways (85%), American Airlines( 75%).

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

    On average you can expect to pay $292 for a flight from Phoenix Sky Harbor Intl Airport to Ontario. The cheapest flight overall is $115 while the most popular route, (Phoenix Sky Harbor Intl - Ontario) is currently priced at $128.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sky Harbor Intl to Ontario 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 Phoenix Sky Harbor Intl Airport to Ontario?

    Currently, January is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Ontario (average of $29). Flying from Phoenix Sky Harbor Intl Airport to Ontario in July is currently the most expensive (average of $79). 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

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Top 3 airlines flying from Sky Harbor Intl to Ontario

Discover the top 3 airlines that operate flights from Sky Harbor Intl to Ontario. 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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$280FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$269FlexibilityNo cancel feeOn-time63%

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