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$59+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Apr 19 — Apr 261
Sun 4/19
Sun 4/26
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 Wednesday

Cheap 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 March 20, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Mon 4/139:02 pm
ONT
-
PHX
1 stop15h 53m
Frontier
Wed 4/222:05 pm
PHX
-
ONT
1 stop4h 44m
Frontier
Deal found 3/18$146
This Southwest deal was found by Cheapflights users on 3/16. 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.
Thu 4/235:05 pm
ONT
-
PHX
1 stop3h 10m
Southwest
Thu 4/303:10 pm
PHX
-
ONT
Nonstop1h 15m
Southwest
Deal found 3/16$147
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Tue 4/147:44 pm
ONT
-
PHX
1 stop4h 05m
Frontier
Mon 4/205:08 pm
PHX
-
ONT
1 stop17h 36m
Frontier
Deal found 3/18$148
This CheapOair deal was found by Cheapflights users on 3/19. 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 4/96:20 am
ONT
-
PHX
1 stop7h 25m
Frontier
Sun 4/121:50 pm
PHX
-
ONT
1 stop18h 14m
Frontier
Deal found 3/19$151
This Southwest deal was found by Cheapflights users on 3/18. 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.
Thu 5/73:55 pm
ONT
-
PHX
2 stops5h 20m
Southwest
Mon 5/119:35 am
PHX
-
ONT
Nonstop1h 20m
Southwest
Deal found 3/18$152
This Southwest deal was found by Cheapflights users on 3/15. 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.
Thu 4/166:50 pm
ONT
-
PHX
1 stop4h 05m
Southwest
Fri 4/172:05 pm
PHX
-
ONT
1 stop6h 00m
Southwest
Deal found 3/15$157
This Southwest deal was found by Cheapflights users on 3/15. 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 4/283:45 pm
ONT
-
PHX
2 stops5h 25m
Southwest
Wed 4/298:30 am
PHX
-
ONT
1 stop3h 05m
Southwest
Deal found 3/15$158
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Sat 4/1811:44 am
ONT
-
PHX
1 stop5h 08m
Frontier
Wed 4/222:05 pm
PHX
-
ONT
1 stop4h 44m
Frontier
Deal found 3/18$159
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Thu 4/1611:47 am
ONT
-
PHX
1 stop4h 17m
Frontier
Tue 4/212:05 pm
PHX
-
ONT
1 stop4h 44m
Frontier
Deal found 3/18$160
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/16:20 am
ONT
-
PHX
1 stop25h 16m
Frontier
Wed 4/84:27 pm
PHX
-
ONT
1 stop4h 33m
Frontier
Deal found 3/19$163
This Booking.com deal was found by Cheapflights users on 3/20. 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.
Sat 4/2512:59 am
ONT
-
PHX
1 stop6h 37m
Frontier
Fri 5/19:24 pm
PHX
-
ONT
1 stop26h 31m
Frontier
Deal found 3/20$166

Find 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 March 20, 2026.

Round-trip from

$146
(Kiwi.com)

One-way from

$59
(Southwest)

Popular in

March

Cheapest in

September

Average price

$328
From Ontario to Phoenix
Search Deals
One-way flight from Ontario to Phoenix
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 20, 2026.
Use the filters below to find and compare flights from Ontario to Phoenix that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 4/10

12:40 pm-2:00 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Mon 4/13

5:05 pm-11:05 pm

1 stop6h 00m

$147

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 4/16

5:15 am-6:30 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 4/20

6:10 pm-11:05 pm

1 stop4h 55m

$147

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 4/25

9:25 am-2:30 pm

1 stop5h 05m

Phoenix Sky Harbor Intl

Mon 4/27

7:30 am-8:45 am

Nonstop1h 15m

$147

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 5/1

3:55 pm-9:15 pm

2 stops5h 20m

Phoenix Sky Harbor Intl

Mon 5/4

9:55 pm-11:05 pm

Nonstop1h 10m

$152

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 4/16

6:50 pm-10:55 pm

1 stop4h 05m

Phoenix Sky Harbor Intl

Fri 4/17

2:05 pm-8:05 pm

1 stop6h 00m

$157

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 5/28

8:10 am-9:25 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Sun 5/31

5:05 am-11:05 am

1 stop6h 00m

$248

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 4/24

3:55 pm-8:50 pm

1 stop4h 55m

Phoenix Sky Harbor Intl

Sun 4/26

9:10 am-10:30 am

Nonstop1h 20m

$248

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sun 4/5

5:15 am-6:30 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 4/7

10:40 am-11:55 am

Nonstop1h 15m

$254

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 4/9

12:40 pm-2:00 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Sun 4/12

5:05 am-11:05 am

1 stop6h 00m

$264
Quickest round-trip

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 6/24

4:35 pm-5:50 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Sun 6/28

10:55 pm-12:05 am

Nonstop1h 10m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

Showing 1-10 of 19 resultsSorted by cheapest first
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 March 13, 2026.

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 $39). 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 March 20, 2026.

It’s optimal to fly from Ontario to Phoenix at noon. By choosing this option you can save up to 16% 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 March 14, 2026.

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 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 March 20, 2026.

The most flights from ONT to PH1 are scheduled on a Thursday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 March 20, 2026.
Read reviews from past customers who have flown Southwest,JetBlue, andAmerican Airlines 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
4,324 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
JetBlue
7.2
Good
2,909 reviews
Southwest
8.0
Very good
4,324 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.1
Good
11,490 reviews
Southwest
8.0
Very good
4,324 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.7
Fair
3,024 reviews
Southwest
8.0
Very good
4,324 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 11 daily outbound flights to Phoenix from 4 different airlines.

  • How long is the flight from Ontario to Phoenix?

    For as low as $147, Southwest can have you in Phoenix from Ontario in 1h 20m. There are 324 mi between Ontario and Phoenix. All flights are typically nonstop.

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

    Frontier, at $78, 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 70% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Ontario to Phoenix one-way?

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $48. However, be on the lookout for offers from American Airlines and Frontier, as they are both options that can get you from Ontario to Phoenix for a low price.

  • 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: Porter Airlines (93%), Southwest (87%), American Airlines( 84%).

  • What are the cheapest flights from Ontario to Phoenix?

    Looking at all options, your cheapest flight can be booked for $134. While the most popular route (Ontario - Phoenix Sky Harbor Intl) can be booked for $117 on average, our data indicates $656 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 $39). 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

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Ontario to Phoenix

Discover the top 4 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 March 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$168FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$267FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$124Average$307FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$228Average$308FlexibilityNo cancel feeOn-time62%

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