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$63+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Phoenix 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 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 September 11, 2025.

Round-trip from

$131
(Southwest)

One-way from

$63
(Southwest)

Popular in

July

Cheapest in

August

Average price

$208
From Ontario to Phoenix
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One-way flight from Ontario to Phoenix
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Highest demand for flights based on searches. 2% potential increase in price ($6 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 September 2025
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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 September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/10. 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 10/77:15 pmONT - PHX
Nonstop1h 20mSouthwest
Tue 10/148:35 amPHX - ONT
Nonstop1h 20mSouthwest
Deal found 9/10$131
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/18:59 pmONT - PHX
1 stop10h 33mFrontier
Wed 10/84:14 pmPHX - ONT
1 stop7h 36mFrontier
Deal found 9/10$137
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/86:53 amONT - PHX
1 stop8h 11mFrontier
Wed 10/157:30 pmPHX - ONT
1 stop28h 20mFrontier
Deal found 9/10$139
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 9/287:30 pmONT - PHX
1 stop3h 12mFrontier
Sun 10/57:40 amPHX - ONT
1 stop7h 44mFrontier
Deal found 9/11$143
This CheapOair deal was found by Cheapflights users on 9/10. 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 9/194:08 pmONT - PHX
1 stop7h 49mFrontier
Mon 9/2210:31 amPHX - ONT
1 stop3h 29mFrontier
Deal found 9/10$144
This CheapOair deal was found by Cheapflights users on 9/10. 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 10/96:54 pmONT - PHX
1 stop4h 47mFrontier
Sun 10/125:45 amPHX - ONT
1 stop6h 09mFrontier
Deal found 9/10$145
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/86:53 amONT - PHX
1 stop8h 11mFrontier
Thu 10/94:55 pmPHX - ONT
1 stop7h 12mFrontier
Deal found 9/10$146
This Booking.com deal was found by Cheapflights users on 9/11. 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.
Sun 10/126:44 pmONT - PHX
1 stop4h 57mFrontier
Mon 10/135:45 amPHX - ONT
1 stop6h 02mFrontier
Deal found 9/11$148
This Frontier deal was found by Cheapflights users on 9/10. 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.
Sat 10/118:00 amONT - PHX
1 stop4h 23mFrontier
Sat 10/114:14 pmPHX - ONT
1 stop7h 36mFrontier
Deal found 9/10$149
This CheapOair deal was found by Cheapflights users on 9/10. 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 9/238:00 amONT - PHX
1 stop14h 21mFrontier
Wed 10/84:14 pmPHX - ONT
1 stop7h 36mFrontier
Deal found 9/10$150
This CheapOair deal was found by Cheapflights users on 9/10. 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 9/118:59 pmONT - PHX
1 stop10h 33mFrontier
Mon 9/2210:31 amPHX - ONT
1 stop3h 29mFrontier
Deal found 9/10$151

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 September 11, 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

Tue 10/7

8:50 am-10:05 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Wed 10/8

8:35 am-9:55 am

Nonstop1h 20m

$131

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 10/7

4:35 pm-10:05 pm

1 stop5h 30m

Phoenix Sky Harbor Intl

Tue 10/14

11:05 am-12:20 pm

Nonstop1h 15m

$141

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 10/8

2:20 pm-3:40 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Thu 10/9

7:40 am-9:00 am

Nonstop1h 20m

$151

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 10/16

3:00 pm-4:20 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Tue 10/21

8:55 pm-10:05 pm

Nonstop1h 10m

$151

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 10/11

1:37 pm-11:41 pm

1 stop10h 04m

Phoenix Sky Harbor Intl

Sun 10/12

5:45 am-11:54 am

1 stop6h 09m

$155

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 10/11

10:09 am-11:30 am

Nonstop1h 21m

Phoenix Sky Harbor Intl

Mon 10/13

8:03 am-9:19 am

Nonstop1h 16m

$156

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 11/13

8:25 pm-10:45 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Mon 11/17

8:45 pm-8:55 pm

Nonstop1h 10m

$157

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 10/6

5:55 pm-7:15 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Mon 10/13

7:50 pm-9:00 pm

Nonstop1h 10m

$164

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 10/24

4:49 pm-6:07 pm

Nonstop1h 18m

Phoenix Sky Harbor Intl

Fri 10/31

2:10 pm-3:24 pm

Nonstop1h 14m

$172

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 10/21

6:40 am-7:55 am

Nonstop1h 15m

$66

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 19 results
1
2

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 August 29, 2025.

The best time to book flights from Ontario to Phoenix is 75 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, January is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $258). Flying from Ontario to Phoenix 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 Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s optimal to fly from Ontario to Phoenix at noon. By choosing this option you can save up to 10% on the cost of your flight, compared to a flight in the evening.

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 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

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 September 11, 2025.

The most flights from ONT to PH1 are scheduled on a Thursday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 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 September 11, 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
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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 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 $131, Southwest 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 $63, 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 75% 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: Southwest (85%), SkyWest Airlines (83%), British Airways( 76%).

  • What are the cheapest flights from Ontario to Phoenix?

    Looking at all options, your cheapest flight can be booked for $48. While the most popular route (Ontario - Phoenix Sky Harbor Intl) can be booked for $131 on average, our data indicates $756 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, January is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $258). Flying from Ontario to Phoenix 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.

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$161FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$107Average$261FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$127Average$290FlexibilityNo cancel feeOn-time71%

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