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$59+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Apr 19 — Apr 261
Sun 4/19
Sun 4/26
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 Wednesday or Saturday and return on a Wednesday

Cheap 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 March 20, 2026.

This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 4/148:20 pm
PHX
-
ONT
Nonstop1h 10m
Southwest
Tue 4/213:45 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Deal found 3/17$117
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.
Tue 4/148:30 am
PHX
-
ONT
1 stop3h 05m
Southwest
Wed 4/1512:40 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Deal found 3/16$123
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:30 am
PHX
-
ONT
1 stop3h 05m
Southwest
Sat 5/25:40 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/19$133
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 4/98:05 pm
PHX
-
ONT
Nonstop1h 10m
Southwest
Mon 4/135:15 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/16$137
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/142:05 pm
PHX
-
ONT
1 stop4h 44m
Frontier
Sat 4/2512:59 am
ONT
-
PHX
1 stop6h 37m
Frontier
Deal found 3/19$140
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.
Sat 4/256:15 am
PHX
-
ONT
2 stops6h 00m
Southwest
Mon 4/276:00 pm
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/16$152

Find 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 March 20, 2026.

Round-trip from

$117
(Southwest)

One-way from

$59
(American Airlines)

Popular in

November

Cheapest in

September

Average price

$283
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. 5% potential increase in price ($12 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 March 2026
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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 March 20, 2026.
Use the filters below to find and compare flights from Phoenix to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 4/18

7:05 pm-8:15 pm

Nonstop1h 10m

Ontario

Mon 4/20

8:10 am-9:25 am

Nonstop1h 15m

$137

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 4/17

3:10 pm-4:25 pm

Nonstop1h 15m

Ontario

Fri 4/24

8:10 am-9:25 am

Nonstop1h 15m

$137

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 4/17

9:35 am-10:55 am

Nonstop1h 20m

Ontario

Mon 4/20

5:05 pm-10:10 pm

1 stop5h 05m

$147

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 4/25

6:15 am-12:15 pm

2 stops6h 00m

Ontario

Mon 4/27

6:00 pm-7:15 pm

Nonstop1h 15m

$152

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 5/2

2:55 pm-8:45 pm

2 stops5h 50m

Ontario

Sat 5/9

8:40 am-9:55 am

Nonstop1h 15m

$152

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 4/23

8:05 am-12:55 pm

1 stop4h 50m

Ontario

Sat 4/25

10:30 am-4:10 pm

2 stops5h 40m

$229

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 5/22

9:35 am-10:55 am

Nonstop1h 20m

Ontario

Tue 5/26

3:30 pm-7:45 pm

1 stop4h 15m

$238

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 4/5

7:50 am-9:20 am

Nonstop1h 30m

Ontario

Sat 4/11

8:40 am-9:55 am

Nonstop1h 15m

$254
Cheapest one-way

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 5/6

8:30 am-11:35 am

1 stop3h 05m

$64

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 4/14

10:40 am-11:55 am

Nonstop1h 15m

$69

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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 March 13, 2026.

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 $46). Flying from Phoenix to Ontario in June 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 March 20, 2026.

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 11% versus a flight in the evening.

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 March 14, 2026.

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. Thursday 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 March 20, 2026.

The most flights from PH1 to ONT are scheduled on a Tuesday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 March 20, 2026.
Read reviews from past customers who have flown Southwest,American Airlines, andFrontier 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
4,324 reviews

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,482 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,023 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 10 inbound flights from Phoenix per day.

  • How long is the flight from Phoenix to Ontario?

    Southwest can get you from Phoenix to Ontario in just under 1h 10m. Your travel time will be generally consistent. There are 324 mi between Phoenix and Ontario. Generally, flights for this route are nonstop.

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

    Frontier, at $84, 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 64% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $48. Users have also found prices from $58 and $67 on American Airlines and Frontier, respectively.

  • What are the most reliable airlines from Phoenix to Ontario?

    The top 3 most reliable airlines when flying from Phoenix to Ontario are British Airways (89%), American Airlines (86%) and Porter Airlines (82%).

  • What are the cheapest flights from Phoenix to Ontario?

    While on average a flight from Phoenix to Ontario is generally $248, 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 $127 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 $46). Flying from Phoenix to Ontario in June 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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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 March 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$174FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$273FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$263FlexibilityNo cancel feeOn-time63%

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