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$54+ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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Cheapflights Tip: The best prices from Phoenix to Ontario are usually found in September or August, booked 85 days in advance, depart on a Sunday or Monday and return on a Wednesday

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 October 29, 2025.

This Frontier deal was found by Cheapflights users on 10/28. 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 11/1310:00 pmPHX - ONT
1 stop10h 17mFrontier
Mon 11/171:46 pmONT - PHX
1 stop8h 17mFrontier
Deal found 10/28$110
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/97:43 pmPHX - ONT
1 stop26h 34mFrontier
Tue 12/166:15 amONT - PHX
1 stop11h 16mFrontier
Deal found 10/28$111
This Mytrip deal was found by Cheapflights users on 10/28. 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.
Tue 11/119:05 pmPHX - ONT
1 stop25h 24mFrontier
Tue 11/188:45 amONT - PHX
1 stop7h 16mFrontier
Deal found 10/28$116
This Booking.com deal was found by Cheapflights users on 10/27. 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.
Thu 12/47:00 amPHX - ONT
1 stop5h 09mFrontier
Mon 12/85:18 pmONT - PHX
1 stop24h 13mFrontier
Deal found 10/27$117
This CheapOair deal was found by Cheapflights users on 10/27. 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.
Wed 12/34:32 pmPHX - ONT
1 stop19h 37mFrontier
Thu 12/410:12 pmONT - PHX
1 stop24h 43mFrontier
Deal found 10/27$122
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/69:16 amPHX - ONT
1 stop6h 09mFrontier
Mon 12/86:15 amONT - PHX
2 stops10h 17mFrontier
Deal found 10/29$129
This Frontier deal was found by Cheapflights users on 10/28. 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.
Tue 11/1111:38 amPHX - ONT
1 stop10h 04mFrontier
Wed 11/128:45 amONT - PHX
1 stop12h 13mFrontier
Deal found 10/28$130
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/259:58 amPHX - ONT
1 stop8h 24mFrontier
Mon 1/52:45 pmONT - PHX
1 stop8h 05mFrontier
Deal found 10/29$131
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/37:43 pmPHX - ONT
1 stop19h 21mFrontier
Sun 12/72:59 pmONT - PHX
1 stop8h 32mFrontier
Deal found 10/28$132
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/249:58 amPHX - ONT
1 stop8h 17mFrontier
Thu 1/16:45 amONT - PHX
1 stop16h 44mFrontier
Deal found 10/29$133
This CheapOair deal was found by Cheapflights users on 10/27. 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 11/137:01 amPHX - ONT
1 stop3h 09mFrontier
Thu 11/206:30 amONT - PHX
1 stop14h 08mFrontier
Deal found 10/27$136
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/2511:30 amPHX - ONT
2 stops10h 47mFrontier
Wed 1/78:00 amONT - PHX
1 stop12h 06mFrontier
Deal found 10/29$140

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 October 29, 2025.

Round-trip from

$110
(Frontier)

One-way from

$54
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$197
From Phoenix to Ontario
Search Deals
One-way flight from Phoenix to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($33 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 October 2025
Search Deals

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 October 29, 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 1/20

3:38 pm-9:17 pm

1 stop6h 39m

Ontario

Sat 1/31

8:30 am-2:33 pm

1 stop5h 03m

$133

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 11/7

10:53 am-6:28 pm

1 stop8h 35m

Ontario

Tue 11/11

8:45 am-4:06 pm

1 stop6h 21m

$143

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 11/14

12:55 pm-11:50 pm

1 stop11h 55m

Ontario

Wed 11/19

8:45 am-5:01 pm

1 stop7h 16m

$143

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 12/24

9:58 am-5:15 pm

1 stop8h 17m

Ontario

Mon 1/5

6:00 am-4:54 pm

2 stops9h 54m

$151

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 1/15

2:10 pm-9:21 pm

1 stop8h 11m

Ontario

Mon 1/19

10:12 pm-2:33 pm

2 stops15h 21m

$163

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 11/9

7:01 am-7:17 am

1 stop25h 16m

Ontario

Sun 11/16

4:15 pm-12:13 am

1 stop6h 58m

$182

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 11/1

2:10 pm-8:42 pm

1 stop6h 32m

Ontario

Sun 11/16

4:15 pm-12:13 am

1 stop6h 58m

$202

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 11/2

9:35 am-12:51 pm

1 stop4h 16m

Ontario

Fri 11/7

4:05 pm-12:29 am

1 stop7h 24m

$202

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 1/15

8:48 am-9:08 am

Nonstop1h 20m

Ontario

Mon 1/19

4:45 pm-7:06 pm

Nonstop1h 21m

$231

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 12/6

2:45 pm-3:00 pm

Nonstop1h 15m

Ontario

Mon 12/8

6:30 pm-8:50 pm

Nonstop1h 20m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 23 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 October 24, 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 85 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, February is the cheapest month in which you can book a flight from Phoenix to Ontario (average of $24). Flying from Phoenix to Ontario in July is currently the most expensive (average of $79). 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 October 29, 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 34% 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 Wednesday mornings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 29, 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
4,241 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

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
11,032 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

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
3,124 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

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 4 inbound flights from Phoenix per day.

  • How long is the flight from Phoenix to Ontario?

    Frontier can get you from Phoenix to Ontario in just under 6h 39m. Your travel time can differ by up to . There are 324 mi between Phoenix and Ontario.

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

    Frontier, at $68, 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 71% 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 (91%), American Airlines (84%) and British Airways (78%).

  • What are the cheapest flights from Phoenix to Ontario?

    While on average a flight from Phoenix to Ontario is generally $308, our data shows the cheapest flight currently is $107. When looking at the most popular route, (Phoenix Sky Harbor Intl - Ontario), you can expect to pay $110 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, February is the cheapest month in which you can book a flight from Phoenix to Ontario (average of $24). Flying from Phoenix to Ontario in July is currently the most expensive (average of $79). 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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$276FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$98Average$273FlexibilityNo cancel feeOn-time63%

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