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$66+ Cheap flights from Phoenix to Ontario (ONT)

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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Phoenix to Ontario are usually found in October or September, booked 74 days in advance, depart on a Saturday or Tuesday and return on a Wednesday

Cheap flight deals from Phoenix to Ontario

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

$66
(Southwest)

Popular in

December

Cheapest in

October

Average price

$201
From Phoenix to Ontario
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One-way flight from Phoenix to Ontario
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Highest demand for flights based on searches. 7% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% 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 Phoenix to Ontario

Cheapest flights from Phoenix to Ontario
Explore the most affordable flight options available from Phoenix to Ontario. 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 9/9. 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 10/77:25 pmPHX - ONT
Nonstop1h 15mSouthwest
Tue 10/147:15 pmONT - PHX
Nonstop1h 20mSouthwest
Deal found 9/9$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.
Fri 11/710:53 pmPHX - ONT
1 stop13h 17mFrontier
Mon 11/1012:05 pmONT - PHX
1 stop11h 39mFrontier
Deal found 9/10$139
This Cheapflightsfares deal was found by Cheapflights users on 9/8. 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.
Fri 10/319:17 amPHX - ONT
1 stop3h 34mFrontier
Mon 11/31:46 pmONT - PHX
1 stop8h 17mFrontier
Deal found 9/8$142
This Cheapflightsfares deal was found by Cheapflights users on 9/8. 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.
Mon 9/2210:31 amPHX - ONT
1 stop3h 29mFrontier
Fri 9/267:30 pmONT - PHX
1 stop3h 12mFrontier
Deal found 9/8$143
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/264:10 pmPHX - ONT
1 stop7h 28mFrontier
Mon 9/292:45 pmONT - PHX
1 stop4h 49mFrontier
Deal found 9/10$144
This Flybillet 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 Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:00 amPHX - ONT
1 stop5h 38mFrontier
Mon 10/66:00 amONT - PHX
1 stop3h 36mFrontier
Deal found 9/10$145
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 10/57:40 amPHX - ONT
1 stop7h 44mFrontier
Mon 10/62:45 pmONT - PHX
1 stop4h 49mFrontier
Deal found 9/11$146
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.
Mon 9/1510:31 amPHX - ONT
1 stop3h 29mFrontier
Tue 9/168:00 amONT - PHX
1 stop14h 21mFrontier
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.
Fri 9/196:00 amPHX - ONT
1 stop5h 43mFrontier
Sun 9/2110:28 pmONT - PHX
1 stop21h 06mFrontier
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.
Fri 9/128:20 pmPHX - ONT
1 stop23h 34mFrontier
Fri 9/194:08 pmONT - PHX
1 stop7h 49mFrontier
Deal found 9/10$151
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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 10/235:45 amPHX - ONT
1 stop3h 25mFrontier
Tue 10/286:53 amONT - PHX
1 stop5h 22mFrontier
Deal found 9/9$152

Cheapflights Fare Finder

 
Customize your flight search to find flights from Phoenix to Ontario 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 Phoenix to Ontario that are best for you.

Fly from

Phoenix

Fly to

Ontario

Route

Depart

Return

Price

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 10/7

7:25 pm-8:40 pm

Nonstop1h 15m

Ontario

Tue 10/14

7:15 pm-8:35 pm

Nonstop1h 20m

$131

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 10/8

4:35 pm-10:45 pm

1 stop6h 10m

Ontario

Wed 10/15

7:15 pm-8:35 pm

Nonstop1h 20m

$141

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 10/11

7:40 pm-8:50 pm

Nonstop1h 10m

Ontario

Wed 10/15

4:25 pm-5:45 pm

Nonstop1h 20m

$141

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 9/24

12:39 pm-7:54 pm

1 stop7h 15m

Ontario

Mon 9/29

2:45 pm-7:34 pm

1 stop4h 49m

$144

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 10/6

10:31 am-2:00 pm

1 stop3h 29m

Ontario

Wed 10/8

6:53 am-3:04 pm

1 stop8h 11m

$144

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 10/2

6:00 am-11:38 am

1 stop5h 38m

Ontario

Mon 10/6

6:00 am-9:36 am

1 stop3h 36m

$145

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 9/25

6:00 am-11:38 am

1 stop5h 38m

Ontario

Thu 10/2

6:00 am-2:05 pm

1 stop8h 05m

$145

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 10/13

9:59 pm-11:50 pm

1 stop25h 51m

Ontario

Sat 10/25

7:04 am-3:04 pm

1 stop8h 00m

$150

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 10/3

11:09 am-7:54 pm

1 stop8h 45m

Ontario

Tue 10/7

8:00 am-12:06 pm

1 stop4h 06m

$154

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 10/4

12:39 pm-7:54 pm

1 stop7h 15m

Ontario

Tue 10/7

8:00 am-12:06 pm

1 stop4h 06m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
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Best time to book a flight from Phoenix to Ontario

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

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

Use this chart to determine the optimal time to book a round-trip flight from Phoenix to Ontario. Price data was last updated on August 29, 2025.

The price you pay for your flight from Phoenix to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 74 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Phoenix to Ontario?

Currently, August is the cheapest month in which you can book a flight from Phoenix to Ontario (average of $246). Flying from Phoenix to Ontario in March is currently the most expensive (average of $328). 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 PHX to ONT?

Find hourly flight availability from Phoenix to Ontario. 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.

When flying from Phoenix to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 7% versus a flight in the morning.

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

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

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

Weekly flight availability from Phoenix to Ontario

Explore weekly flight availability from Phoenix to Ontario. 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 PH1 to ONT are scheduled on a Thursday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated September 11, 2025.
Read reviews from past customers who have flown Southwest, American Airlines, and Frontier from Phoenix to Ontario. 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

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

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

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

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

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

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

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

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 Phoenix to Ontario. 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 into for flights to Ontario from Phoenix?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from Phoenix to Ontario. 3 airlines have flights to Ontario from Phoenix on a regular basis. Booking flights from Phoenix to Ontario should not be difficult; the airport handles an average of 7 inbound flights from Phoenix per day.

  • How long is the flight from Phoenix to Ontario?

    Southwest and Frontier can get you from Phoenix to Ontario in just under 1h 15m. Your travel time can differ by up to 6h. There are 324 mi between Phoenix and Ontario. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Frontier, at $56, was found to be the cheapest airline from Phoenix to Ontario.Alternate airlines to your destination round-trip include American Airlines and Southwest. 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 Phoenix to Ontario?

    The top 3 most reliable airlines when flying from Phoenix to Ontario are SkyWest Airlines (88%), American Airlines (85%) and Southwest (79%).

  • What are the cheapest flights from Phoenix to Ontario?

    While on average a flight from Phoenix to Ontario is generally $185, our data shows the cheapest flight currently is $48. When looking at the most popular route, (Phoenix Sky Harbor Intl - Ontario), you can expect to pay $142 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Phoenix to Ontario 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 Phoenix to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Phoenix to Ontario (average of $246). Flying from Phoenix to Ontario in March is currently the most expensive (average of $328). 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 Phoenix to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Phoenix to Ontario

Discover the top 3 airlines that operate flights from Phoenix to Ontario. 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$56Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$271FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$105Average$265FlexibilityNo cancel feeOn-time63%

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