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Ontario

$49+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 Tuesday

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 January 29, 2026.

This American Airlines deal was found by Cheapflights users on 1/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/174:02 pm
PHX
-
ONT
Nonstop1h 20m
American Airlines
Wed 2/1812:18 pm
ONT
-
PHX
Nonstop1h 23m
American Airlines
Deal found 1/28$97
This Southwest deal was found by Cheapflights users on 1/26. 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 2/253:10 pm
PHX
-
ONT
1 stop3h 00m
Southwest
Wed 3/43:20 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Deal found 1/26$103
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:51 pm
PHX
-
ONT
1 stop27h 43m
Frontier
Tue 3/38:40 am
ONT
-
PHX
1 stop7h 39m
Frontier
Deal found 1/27$106
This Southwest deal was found by Cheapflights users on 1/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/178:45 am
PHX
-
ONT
Nonstop1h 20m
Southwest
Wed 2/183:15 pm
ONT
-
PHX
1 stop4h 30m
Southwest
Deal found 1/27$107
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:00 am
PHX
-
ONT
1 stop16h 34m
Frontier
Thu 2/267:22 pm
ONT
-
PHX
1 stop12h 28m
Frontier
Deal found 1/27$119
This Southwest deal was found by Cheapflights users on 1/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/244:15 pm
PHX
-
ONT
2 stops5h 05m
Southwest
Tue 3/310:00 am
ONT
-
PHX
1 stop4h 05m
Southwest
Deal found 1/27$122
This Frontier deal was found by Cheapflights users on 1/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:17 pm
PHX
-
ONT
1 stop10h 17m
Frontier
Tue 3/38:40 am
ONT
-
PHX
1 stop7h 39m
Frontier
Deal found 1/27$128
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 2/129:30 am
PHX
-
ONT
1 stop4h 41m
Frontier
Sun 2/1510:18 pm
ONT
-
PHX
1 stop9h 52m
Frontier
Deal found 1/26$129
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Fri 3/610:24 pm
PHX
-
ONT
1 stop26h 35m
Frontier
Mon 3/163:30 pm
ONT
-
PHX
1 stop23h 48m
Frontier
Deal found 1/28$130
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 2/213:05 pm
PHX
-
ONT
1 stop5h 09m
Frontier
Sun 2/2210:18 pm
ONT
-
PHX
1 stop9h 52m
Frontier
Deal found 1/26$131

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 January 29, 2026.

Round-trip from

$97
(American Airlines)

One-way from

$49
(American Airlines)

Popular in

November

Cheapest in

September

Average price

$269
From Phoenix to Ontario
Search Deals
One-way flight from Phoenix to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 29, 2026.
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

Wed 2/25

8:50 pm-9:05 pm

Nonstop1h 15m

Ontario

Wed 3/4

11:15 am-1:35 pm

Nonstop1h 20m

$97

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 3/18

11:45 am-1:05 pm

Nonstop1h 20m

Ontario

Tue 3/24

9:20 am-2:50 pm

1 stop5h 30m

$107

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 2/17

8:45 am-9:05 am

Nonstop1h 20m

Ontario

Wed 2/18

3:15 pm-8:45 pm

1 stop4h 30m

$107

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 3/17

11:45 am-1:05 pm

Nonstop1h 20m

Ontario

Tue 3/24

2:20 pm-7:55 pm

1 stop5h 35m

$107

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 2/12

9:30 am-1:11 pm

1 stop4h 41m

Ontario

Sun 2/15

10:18 pm-9:10 am

1 stop9h 52m

$129

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 3/5

8:50 am-9:20 am

Nonstop1h 30m

Ontario

Tue 3/10

8:30 am-9:45 am

Nonstop1h 15m

$134

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 2/25

3:10 pm-5:10 pm

1 stop3h 00m

$54

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 4/28

7:17 am-8:39 am

Nonstop1h 22m

$79

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 3/26

5:30 am-8:20 am

1 stop2h 50m

$96

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 3/9

10:32 am-3:37 pm

1 stop5h 05m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 16 results
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 January 23, 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 $26). 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 January 29, 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 14% 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 January 24, 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. Monday at noon 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 January 29, 2026.

The most flights from PH1 to ONT are scheduled on a Tuesday (10 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 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 January 29, 2026.
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
4,267 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
11,205 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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 6 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 15m. 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 $79, 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 66% 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 $54 and $63 on Frontier and American Airlines, respectively.

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

    The top 3 most reliable airlines when flying from Phoenix to Ontario are Porter Airlines (83%), Southwest (80%) and American Airlines (76%).

  • What are the cheapest flights from Phoenix to Ontario?

    While on average a flight from Phoenix to Ontario is generally $285, our data shows the cheapest flight currently is $95. When looking at the most popular route, (Phoenix Sky Harbor Intl - Ontario), you can expect to pay $97 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 $26). 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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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$79Average$171FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$280FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$263FlexibilityNo cancel feeOn-time63%

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