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$64+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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1. Tell us where you want to go

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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 December 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/275:16 pmONT - PHX
1 stop14h 32mFrontier
Tue 1/611:26 amPHX - ONT
1 stop4h 43mFrontier
Deal found 12/16$161
This Super.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/316:00 amONT - PHX
1 stop25h 48mFrontier
Sun 1/410:26 pmPHX - ONT
1 stop19h 49mFrontier
Deal found 12/17$173
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:17 pmONT - PHX
1 stop13h 31mFrontier
Tue 1/201:59 pmPHX - ONT
1 stop25h 13mFrontier
Deal found 12/16$174
This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:00 amONT - PHX
1 stop25h 48mFrontier
Thu 1/19:58 amPHX - ONT
1 stop12h 19mFrontier
Deal found 12/15$175
This Mytrip deal was found by Cheapflights users on 12/17. 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 12/316:00 amONT - PHX
1 stop25h 48mFrontier
Fri 1/210:26 pmPHX - ONT
1 stop25h 55mFrontier
Deal found 12/17$176
This Super.com deal was found by Cheapflights users on 12/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:00 pmONT - PHX
1 stop13h 48mFrontier
Wed 12/249:58 amPHX - ONT
1 stop12h 19mFrontier
Deal found 12/16$189
This Super.com deal was found by Cheapflights users on 12/17. 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.
Mon 12/296:00 amONT - PHX
1 stop25h 48mFrontier
Wed 12/317:00 amPHX - ONT
1 stop17h 59mFrontier
Deal found 12/17$190
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:55 pmONT - PHX
Nonstop1h 21mAmerican Airlines
Thu 12/258:27 amPHX - ONT
Nonstop1h 20mAmerican Airlines
Deal found 12/16$191
This Super.com deal was found by Cheapflights users on 12/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amONT - PHX
1 stop14h 16mFrontier
Thu 1/19:31 amPHX - ONT
1 stop15h 28mFrontier
Deal found 12/16$195
This Gotogate deal was found by Cheapflights users on 12/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:00 pmONT - PHX
1 stop26h 16mFrontier
Sat 1/36:05 amPHX - ONT
1 stop18h 16mFrontier
Deal found 12/16$196

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 December 18, 2025.

Round-trip from

$128
(Frontier)

One-way from

$64
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$354
From Ontario to Phoenix
Search Deals
One-way flight from Ontario to Phoenix
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 18, 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

Thu 2/5

2:06 pm-11:09 pm

1 stop8h 03m

Phoenix Sky Harbor Intl

Tue 2/10

6:00 am-9:34 pm

1 stop16h 34m

$152

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 1/7

3:20 pm-5:40 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Thu 1/8

4:40 pm-4:55 pm

Nonstop1h 15m

$152

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 1/6

3:25 pm-8:45 pm

1 stop4h 20m

Phoenix Sky Harbor Intl

Wed 1/7

11:20 am-4:05 pm

1 stop5h 45m

$153

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 1/15

2:34 pm-11:59 pm

2 stops8h 25m

Phoenix Sky Harbor Intl

Thu 1/22

4:52 pm-7:53 pm

1 stop4h 01m

$165

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 1/8

6:00 am-8:13 pm

1 stop13h 13m

Phoenix Sky Harbor Intl

Mon 1/12

10:03 am-2:51 pm

1 stop5h 48m

$169

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sun 1/18

5:55 am-8:10 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 1/27

8:55 am-2:20 pm

1 stop6h 25m

$172

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 2/3

3:07 pm-2:22 pm

2 stops22h 15m

Phoenix Sky Harbor Intl

Fri 2/6

2:34 pm-7:53 pm

1 stop6h 19m

$180

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 1/15

5:40 am-12:15 pm

1 stop5h 35m

Phoenix Sky Harbor Intl

Thu 1/15

9:05 pm-9:20 pm

Nonstop1h 15m

$181

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 3/2

1:18 pm-11:59 pm

1 stop9h 41m

Phoenix Sky Harbor Intl

Thu 3/5

5:05 am-2:29 pm

1 stop10h 24m

$181

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 1/10

1:45 pm-4:00 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 1/12

6:00 am-10:20 am

1 stop5h 20m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 23 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 December 12, 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, April is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $28). 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 December 18, 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 at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Ontario to Phoenix?

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 December 18, 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
7.9
Good
4,252 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

7.9

Comfort

8.0

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

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

7.9

Comfort

8.0

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
7.2
Good
11,054 reviews
Southwest
7.9
Good
4,252 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

7.9

Comfort

8.0

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
5.8
Fair
3,080 reviews
Southwest
7.9
Good
4,252 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

7.9

Comfort

8.0

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 5 daily outbound flights to Phoenix from 3 different airlines.

  • How long is the flight from Ontario to Phoenix?

    For as low as $152, Frontier can have you in Phoenix from Ontario in 1h 20m. 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 $49, 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 80% 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 Frontier and American Airlines, 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 (90%), British Airways (81%), American Airlines( 79%).

  • What are the cheapest flights from Ontario to Phoenix?

    Looking at all options, your cheapest flight can be booked for $109. While the most popular route (Ontario - Phoenix Sky Harbor Intl) can be booked for $133 on average, our data indicates $1,054 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, April is the cheapest month in which you can book a flight from Ontario to Phoenix (average of $28). 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$157FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$260FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$121Average$301FlexibilityNo cancel feeOn-time71%

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