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$55+ Cheap flights from Ontario (ONT) to Phoenix

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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Dec 5 — Dec 121
Fri 12/5
Fri 12/12
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Phoenix are usually found in September or August, booked 71 days in advance, depart on a Wednesday or Tuesday and return on a Sunday

Find flight deals from Ontario to Phoenix

Cheapest flights from Ontario to Phoenix
Explore the most affordable flight options available from Ontario to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 5, 2025.

This CheapOair deal was found by Cheapflights users on 11/3. 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.
Thu 12/412:04 pmONT - PHX
1 stop8h 17mFrontier
Sat 12/69:16 amPHX - ONT
1 stop6h 09mFrontier
Deal found 11/3$110
This CheapOair deal was found by Cheapflights users on 11/2. 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.
Thu 12/116:15 amONT - PHX
1 stop11h 16mFrontier
Mon 12/159:58 amPHX - ONT
1 stop5h 06mFrontier
Deal found 11/2$116
This Gotogate deal was found by Cheapflights users on 11/3. 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 12/412:04 pmONT - PHX
1 stop8h 17mFrontier
Sun 12/79:16 amPHX - ONT
1 stop6h 50mFrontier
Deal found 11/3$124
This Frontier deal was found by Cheapflights users on 11/2. 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.
Thu 12/412:04 pmONT - PHX
1 stop8h 17mFrontier
Thu 12/116:15 amPHX - ONT
1 stop13h 20mFrontier
Deal found 11/2$128
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Sun 12/72:59 pmONT - PHX
1 stop8h 32mFrontier
Wed 12/107:43 pmPHX - ONT
1 stop19h 21mFrontier
Deal found 11/2$132
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/36:15 amONT - PHX
1 stop11h 16mFrontier
Sun 12/75:53 pmPHX - ONT
1 stop23h 40mFrontier
Deal found 11/2$133
This CheapOair deal was found by Cheapflights users on 11/4. 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 12/36:15 amONT - PHX
1 stop25h 33mFrontier
Fri 12/59:16 amPHX - ONT
1 stop6h 09mFrontier
Deal found 11/4$134
This Booking.com deal was found by Cheapflights users on 11/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:15 amONT - PHX
1 stop11h 16mFrontier
Sun 12/149:59 pmPHX - ONT
1 stop17h 05mFrontier
Deal found 11/3$135
This Mytrip deal was found by Cheapflights users on 11/5. 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 12/26:15 amONT - PHX
1 stop11h 16mFrontier
Wed 12/37:43 pmPHX - ONT
1 stop19h 21mFrontier
Deal found 11/5$136
This Frontier deal was found by Cheapflights users on 11/4. 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.
Fri 12/123:20 pmONT - PHX
1 stop8h 24mFrontier
Sun 12/149:16 amPHX - ONT
1 stop6h 50mFrontier
Deal found 11/4$138
This CheapOair deal was found by Cheapflights users on 11/3. 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.
Fri 11/215:06 pmONT - PHX
1 stop3h 32mFrontier
Mon 11/247:00 amPHX - ONT
1 stop5h 28mFrontier
Deal found 11/3$141

Cheap flight deals from Ontario to Phoenix

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Phoenix (PH1). 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 November 5, 2025.

Round-trip from

$110
(CheapOair)

One-way from

$55
(CheapOair)

Popular in

July

Cheapest in

September

Average price

$272
From Ontario to Phoenix
Search Deals
One-way flight from Ontario to Phoenix
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Phoenix 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 November 5, 2025.
Use the filters below to find and compare flights from Ontario to Phoenix that are best for you.

Fly from

Ontario

Fly to

Phoenix

Route

Depart

Return

Price

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 11/24

12:58 am-8:55 am

1 stop6h 57m

Phoenix Sky Harbor Intl

Mon 12/1

9:23 am-2:26 pm

1 stop6h 03m

$141

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 11/21

12:58 am-8:55 am

1 stop6h 57m

Phoenix Sky Harbor Intl

Wed 11/26

10:11 pm-11:57 pm

1 stop26h 46m

$169

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 1/27

5:55 am-8:10 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Fri 1/30

9:00 am-9:20 am

Nonstop1h 20m

$191

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 1/5

12:55 pm-3:16 pm

Nonstop1h 21m

Phoenix Sky Harbor Intl

Wed 1/7

8:48 am-9:08 am

Nonstop1h 20m

$214

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 12/6

5:30 am-10:55 am

1 stop4h 25m

Phoenix Sky Harbor Intl

Sun 12/7

9:35 am-9:55 am

Nonstop1h 20m

$221

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 12/4

6:50 am-12:40 pm

1 stop4h 50m

Phoenix Sky Harbor Intl

Sun 12/7

9:35 am-9:55 am

Nonstop1h 20m

$221

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 5/4

8:10 am-9:25 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Fri 5/8

7:30 am-8:45 am

Nonstop1h 15m

$231

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 2/20

5:00 pm-7:15 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 2/23

6:50 pm-7:05 pm

Nonstop1h 15m

$234

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 1/5

5:35 am-7:50 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Wed 1/7

3:10 pm-5:10 pm

1 stop3h 00m

$251

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 1/26

10:40 am-3:40 pm

1 stop4h 00m

Phoenix Sky Harbor Intl

Thu 1/29

4:40 pm-4:55 pm

Nonstop1h 15m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

Showing 1-10 of 21 results
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Best time to book a flight from Ontario to Phoenix

Have a flexible travel schedule? Discover the best time to fly to Phoenix 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

How far ahead should I book a flight from Ontario to Phoenix?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Phoenix. Price data was last updated on October 31, 2025.

The best time to book flights from Ontario to Phoenix is 71 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 Ontario to Phoenix?

Currently, November is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $21). Flying from Ontario to Phoenix in July is currently the most expensive (average of $82). 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 Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 5, 2025.

It’s optimal to fly from Ontario to Phoenix in the evening. By choosing this option you can save up to 51% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Ontario to Phoenix?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Phoenix. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Ontario to Phoenix

Explore weekly flight availability from Ontario to Phoenix. 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 November 5, 2025.

The most flights from ONT to PH1 are scheduled on a Monday (12 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 on average).

Reviews of airlines servicing Phoenix

Get insights into the airlines that provide service to Phoenix. 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 Phoenix. Reviews last updated November 5, 2025.
Read reviews from past customers who have flown Southwest, American Airlines, and Frontier from Ontario to Phoenix. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,239 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

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
4,239 reviews
Southwest
8.0
Very good
4,239 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

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
11,039 reviews
Southwest
8.0
Very good
4,239 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

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
3,115 reviews
Southwest
8.0
Very good
4,239 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

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 Phoenix. 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?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Phoenix from Ontario. Booking flights from Ontario (ONT) to Phoenix should be relatively easy as there are 7 daily outbound flights to Phoenix from 3 different airlines.

  • How long is the flight from Ontario to Phoenix?

    For as low as $191, Frontier can have you in Phoenix from Ontario in 1h 15m. There are 324 mi between Ontario and Phoenix. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Phoenix round-trip?

    Frontier, at $60, was found to be the cheapest airline from Ontario to Phoenix.Alternate airlines to your destination round-trip include Southwest and American Airlines. Frontier is 76% 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?

    Before booking your flight to Phoenix from Ontario, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (95%), Porter Airlines (93%), American Airlines( 87%).

  • What are the cheapest flights from Ontario to Phoenix?

    Looking at all options, your cheapest flight can be booked for $101. While the most popular route (Ontario - Phoenix Sky Harbor Intl) can be booked for $110 on average, our data indicates $799 when flying from Ontario to Phoenix.

  • Can I find deals for flights from Ontario to Phoenix that include hotel bookings?

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

  • How can I find direct flights from Ontario to Phoenix?

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

  • Can I find deals for business class flights from Ontario to Phoenix?

    Yes. Cheapflights offers flight deals from Ontario to Phoenix 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?

    Currently, November is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $21). Flying from Ontario to Phoenix in July is currently the most expensive (average of $82). 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.

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Alternative routes for Ontario to Phoenix

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Top 3 airlines flying from Ontario to Phoenix

Discover the top 3 airlines that operate flights from Ontario to Phoenix. 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 November 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$60Average$157FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$263FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$122Average$300FlexibilityNo cancel feeOn-time71%

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