HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Phoenix

$49+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Phoenix with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Phoenix are usually found in August or September, booked 71 days in advance, depart on a Wednesday or Tuesday 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 17, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(American Airlines)

Popular in

July

Cheapest in

August

Average price

$220
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 September 2025
Search Deals

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 17, 2025.

This Southwest deal was found by Cheapflights users on 9/15. 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 10/78:50 amONT - PHX
Nonstop1h 15mSouthwest
Tue 10/148:55 pmPHX - ONT
Nonstop1h 10mSouthwest
Deal found 9/15$97
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 10/2510:06 amONT - PHX
Nonstop1h 21mAmerican Airlines
Mon 10/277:41 amPHX - ONT
Nonstop1h 15mAmerican Airlines
Deal found 9/14$98
This Southwest deal was found by Cheapflights users on 9/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/181:50 pmONT - PHX
Nonstop1h 15mSouthwest
Tue 10/218:10 amPHX - ONT
2 stops5h 35mSouthwest
Deal found 9/17$112
This Southwest deal was found by Cheapflights users on 9/16. 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.
Tue 10/73:50 pmONT - PHX
1 stop4h 20mSouthwest
Wed 10/87:25 amPHX - ONT
1 stop3h 10mSouthwest
Deal found 9/16$117
This Southwest deal was found by Cheapflights users on 9/15. 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.
Sat 11/13:50 pmONT - PHX
2 stops6h 05mSouthwest
Mon 11/35:25 amPHX - ONT
1 stop5h 15mSouthwest
Deal found 9/15$122
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/174:49 pmONT - PHX
Nonstop1h 18mAmerican Airlines
Sat 10/1810:38 amPHX - ONT
Nonstop1h 23mAmerican Airlines
Deal found 9/15$134
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/259:16 amONT - PHX
1 stop4h 49mFrontier
Thu 9/254:59 pmPHX - ONT
1 stop6h 39mFrontier
Deal found 9/15$139
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:00 amONT - PHX
1 stop3h 17mFrontier
Sun 11/29:35 amPHX - ONT
1 stop4h 16mFrontier
Deal found 9/15$143
This Southwest deal was found by Cheapflights users on 9/15. 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.
Fri 10/103:00 pmONT - PHX
Nonstop1h 20mSouthwest
Tue 10/1412:35 pmPHX - ONT
1 stop3h 00mSouthwest
Deal found 9/15$144
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/251:37 pmONT - PHX
1 stop10h 04mFrontier
Sun 10/265:15 amPHX - ONT
1 stop10h 17mFrontier
Deal found 9/15$145

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 17, 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

Sat 10/11

10:55 am-12:10 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 10/14

6:20 am-10:35 am

1 stop4h 15m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 10/15

9:00 am-1:15 pm

1 stop4h 15m

Phoenix Sky Harbor Intl

Wed 10/22

8:55 pm-10:05 pm

Nonstop1h 10m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 10/7

3:15 pm-8:35 pm

1 stop5h 20m

Phoenix Sky Harbor Intl

Wed 10/8

8:55 pm-10:05 pm

Nonstop1h 10m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 11/13

8:25 pm-10:45 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Mon 11/17

5:25 am-9:40 am

1 stop5h 15m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 10/18

1:50 pm-3:05 pm

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 10/21

8:20 am-1:45 pm

1 stop5h 25m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 10/7

5:45 pm-9:15 pm

1 stop3h 30m

Phoenix Sky Harbor Intl

Tue 10/14

11:05 am-12:20 pm

Nonstop1h 15m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 11/1

4:15 pm-10:05 pm

1 stop5h 50m

Phoenix Sky Harbor Intl

Mon 11/3

2:35 pm-2:50 pm

Nonstop1h 15m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 10/29

2:20 pm-3:40 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Mon 11/3

5:25 am-9:40 am

1 stop5h 15m

$107

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 10/30

6:45 am-1:05 pm

2 stops6h 20m

Phoenix Sky Harbor Intl

Mon 11/3

2:35 pm-2:50 pm

Nonstop1h 15m

$112

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 12/15

5:55 am-8:10 am

Nonstop1h 15m

$49

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 17 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 September 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, 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 17, 2025.

It’s optimal to fly from Ontario to Phoenix at noon. By choosing this option you can save up to 11% 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 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 September 17, 2025.

The most flights from ONT to PH1 are scheduled on a Monday (9 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 17, 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
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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 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 6 daily outbound flights to Phoenix from 3 different airlines.

  • How long is the flight from Ontario to Phoenix?

    For as low as $107, Southwest can have you in Phoenix from Ontario in 1h 15m. 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 $61, 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: American Airlines (87%), SkyWest Airlines (87%), Southwest( 86%).

  • 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 $97 on average, our data indicates $569 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Phoenix

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
Santa Ana to Las Vegas flights
Burbank to Las Vegas flights
San Jose to Las Vegas flights
Ontario to Las Vegas flights
Oakland to Las Vegas flights
San Francisco to Sky Harbor Intl flights
Los Angeles to Sky Harbor Intl flights
Sacramento to Las Vegas flights
Santa Ana to Sky Harbor Intl flights
Ontario to Sky Harbor Intl flights
San Jose to Sky Harbor Intl flights
San Diego to Las Vegas flights
Long Beach to Las Vegas flights
Stockton to Las Vegas flights
Burbank to Sky Harbor Intl flights
Fresno to Las Vegas flights
Santa Rosa to Las Vegas flights
San Diego to Sky Harbor Intl flights
Oakland to Sky Harbor Intl flights
Sacramento to Sky Harbor Intl flights
Las Vegas to Sky Harbor Intl flights
Reno to Las Vegas flights
Los Angeles to Tucson flights
Fresno to Sky Harbor Intl flights
San Francisco to Tucson flights
Reno to Sky Harbor Intl flights
Santa Rosa to Sky Harbor Intl flights
Palm Springs to Las Vegas flights
Long Beach to Sky Harbor Intl flights
San Luis Obispo to Las Vegas flights
San Luis Obispo to Sky Harbor Intl flights
Ontario to Tucson flights
San Diego to Tucson flights
Santa Ana to Tucson flights
Palm Springs to Sky Harbor Intl flights
San Francisco to Phoenix-Mesa Gateway flights
Santa Barbara to Sky Harbor Intl flights
Santa Barbara to Las Vegas flights
Medford to Sky Harbor Intl flights
San Jose to Tucson flights
Las Vegas to Tucson flights
Los Angeles to Phoenix-Mesa Gateway flights
Monterey to Sky Harbor Intl flights
Medford to Las Vegas flights
Sacramento to Tucson flights
Monterey to Las Vegas flights
Oakland to Tucson flights
Bakersfield to Sky Harbor Intl flights

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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$162FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$102Average$262FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$124Average$288FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.