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$29+ Cheap flights from Ontario (ONT) to Arizona

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Ontario to Arizona

Keep the following information in mind while searching for Ontario to Arizona flight deals. Data was last updated August 14, 2025.

Round-trip from

$59
(Frontier)

One-way from

$29
(Frontier)

Popular in

June

Cheapest in

September

Average price

$135

Good round-trip deal

$288 or less

Good one-way deal

$140 or less
From Ontario to Arizona
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One-way flight from Ontario to Arizona
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Highest demand for flights based on searches. 12% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Ontario to Arizona.
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Price to beat on a one-way flight from Ontario to Arizona.
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Find flight deals from Ontario to Arizona

Cheapest flights from Ontario to Arizona
Explore the most affordable flight options available from Ontario to Arizona. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Frontier deal was found by Cheapflights users on 8/13. 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.
Fri 11/77:35 pmONT - LAS
Nonstop1h 11mFrontier
Sun 11/96:30 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/13$59
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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 8/186:00 amONT - LAS
Nonstop1h 13mFrontier
Tue 8/193:07 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 8/12$61
This Cheapflightsfares deal was found by Cheapflights users on 8/13. 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 8/186:00 amONT - LAS
Nonstop1h 13mFrontier
Thu 8/217:45 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/13$62
This CheapOair deal was found by Cheapflights users on 8/13. 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.
Mon 8/187:22 pmONT - LAS
Nonstop1h 13mFrontier
Wed 8/203:07 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 8/13$63
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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.
Sun 8/176:00 amONT - LAS
Nonstop1h 13mFrontier
Sun 8/246:30 amLAS - ONT
Nonstop1h 03mFrontier
Deal found 8/12$66
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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 9/2610:28 pmONT - LAS
Nonstop1h 16mFrontier
Sun 9/286:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/12$67
This Frontier deal was found by Cheapflights users on 8/12. 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.
Fri 9/2610:28 pmONT - LAS
Nonstop1h 16mFrontier
Mon 9/296:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/12$68
This Mytrip deal was found by Cheapflights users on 8/12. 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.
Sun 8/176:00 amONT - LAS
Nonstop1h 13mFrontier
Tue 8/193:07 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 8/12$69
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:00 amONT - LAS
Nonstop1h 11mFrontier
Sun 9/146:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/14$71
This Frontier deal was found by Cheapflights users on 8/13. 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 9/201:37 pmONT - LAS
Nonstop1h 17mFrontier
Sat 9/208:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/13$72
This Frontier deal was found by Cheapflights users on 8/12. 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 9/248:00 amONT - LAS
Nonstop1h 11mFrontier
Tue 9/308:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/12$73
This Justfly.com deal was found by Cheapflights users on 8/12. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/28:00 amONT - LAS
Nonstop1h 13mFrontier
Tue 9/98:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 8/12$74

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Arizona 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 August 14, 2025.
Use the filters below to find and compare flights from Ontario to Arizona that are best for you.

Fly from

Ontario

Fly to

Arizona

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 10/2

7:30 pm-8:42 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Sun 10/5

6:10 am-7:17 am

Nonstop1h 07m

$59

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 8/18

7:22 pm-8:35 pm

Nonstop1h 13m

Las Vegas Harry Reid Intl

Wed 8/20

3:07 pm-4:18 pm

Nonstop1h 11m

$63

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 9/25

7:30 pm-8:42 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Sat 9/27

8:49 pm-9:56 pm

Nonstop1h 07m

$66

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 9/26

10:28 pm-11:44 pm

Nonstop1h 16m

Las Vegas Harry Reid Intl

Sun 9/28

6:10 am-7:17 am

Nonstop1h 07m

$66

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 8/17

6:00 am-7:13 am

Nonstop1h 13m

Las Vegas Harry Reid Intl

Fri 8/22

6:30 am-7:33 am

Nonstop1h 03m

$66

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 9/26

10:28 pm-11:44 pm

Nonstop1h 16m

Las Vegas Harry Reid Intl

Mon 9/29

6:10 am-7:17 am

Nonstop1h 07m

$67

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 10/25

8:00 am-9:12 am

Nonstop1h 12m

Las Vegas Harry Reid Intl

Sun 10/26

6:30 am-7:37 am

Nonstop1h 07m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 9/4

7:30 pm-8:42 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Sat 9/13

11:27 am-12:43 pm

Nonstop1h 16m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 9/13

8:00 am-9:11 am

Nonstop1h 11m

Las Vegas Harry Reid Intl

Wed 9/17

8:49 pm-9:56 pm

Nonstop1h 07m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 9/4

9:16 am-10:24 am

Nonstop1h 08m

Las Vegas Harry Reid Intl

Sun 9/7

6:10 am-7:17 am

Nonstop1h 07m

$71

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Arizona

Have a flexible travel schedule? Discover the best time to fly to Arizona 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 Arizona

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Arizona (average of $258). Flying from Ontario to Arizona 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 AZ?

Find hourly flight availability from Ontario to Arizona. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Arizona as you normally would.

Weekly flight availability from Ontario to Arizona

Explore weekly flight availability from Ontario to Arizona. 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 August 14, 2025.

The most flights from ONT to USAZ 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 (5 on average).

Reviews of airlines servicing Arizona

Get insights into the airlines that provide service to Arizona. 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 Arizona. Reviews last updated August 14, 2025.
Read reviews from past customers who have flown Southwest, American Airlines, and Frontier from Ontario to Arizona. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
3,217 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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 Ontario to Arizona. 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 Arizona?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Arizona from Ontario.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $29. However, be on the lookout for offers from Southwest and American Airlines, as they are both options that can get you from Ontario to Arizona for a low price.

  • What are the most popular routes from Ontario to Arizona?

    The most popular route from Ontario to Arizona is Ontario - Las Vegas Harry Reid Intl. You may also consider Ontario - Phoenix Sky Harbor Intl or Ontario - Tucson.

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

    The top 3 most reliable airlines when flying from Ontario to Arizona are SkyWest Airlines (90%), British Airways (90%) and Southwest (74%).

  • What are the cheapest flights from Ontario to Arizona?

    Looking at all options, your cheapest flight can be booked for $48. While the most popular route (Ontario - Las Vegas Harry Reid Intl) can be booked for $54 on average our data indicates $613 when flying from Ontario to Arizona.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Arizona (average of $258). Flying from Ontario to Arizona 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

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Alternative routes for Ontario to Arizona

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

Discover the top 3 airlines that operate flights from Ontario to Arizona. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$171FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$110Average$310FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$133Average$403FlexibilityNo cancel feeOn-time71%

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