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Mesa

$49+ Cheap flights from Ontario (ONT) to Mesa, AZ

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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Mesa are usually found in September or August, booked 71 days in advance, depart on a Wednesday or Tuesday and return on a Sunday

Find flight deals from Ontario to Mesa

Cheapest flights from Ontario to Mesa
Explore the most affordable flight options available from Ontario to Mesa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/21. 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 10/298:00 amONT - PHX
1 stop10h 50mFrontier
Thu 10/306:01 amPHX - ONT
1 stop6h 50mFrontier
Deal found 10/21$98
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 10/288:00 amONT - PHX
1 stop14h 24mFrontier
Wed 10/2911:38 amPHX - ONT
1 stop9h 04mFrontier
Deal found 10/20$99
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 12/36:15 amONT - PHX
1 stop11h 16mFrontier
Fri 12/510:36 pmPHX - ONT
1 stop23h 41mFrontier
Deal found 10/21$109
This Kiwi.com deal was found by Cheapflights users on 10/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/910:43 pmONT - PHX
1 stop8h 37mFrontier
Mon 11/103:31 pmPHX - ONT
1 stop9h 19mFrontier
Deal found 10/19$114
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 11/118:00 amONT - PHX
1 stop9h 50mFrontier
Fri 11/143:31 pmPHX - ONT
1 stop9h 19mFrontier
Deal found 10/20$116
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 12/63:20 pmONT - PHX
1 stop8h 24mFrontier
Mon 12/810:36 pmPHX - ONT
1 stop23h 41mFrontier
Deal found 10/20$122
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 11/112:05 pmONT - PHX
1 stop7h 42mFrontier
Mon 11/310:00 pmPHX - ONT
1 stop23h 42mFrontier
Deal found 10/20$124
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 11/188:00 amONT - PHX
1 stop13h 24mFrontier
Thu 11/2010:43 pmPHX - ONT
1 stop16h 43mFrontier
Deal found 10/21$130
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 12/53:20 pmONT - PHX
1 stop15h 46mFrontier
Mon 12/810:36 pmPHX - ONT
1 stop23h 41mFrontier
Deal found 10/20$133
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 12/46:15 amONT - PHX
1 stop11h 16mFrontier
Thu 12/117:00 amPHX - ONT
1 stop5h 09mFrontier
Deal found 10/20$139

Cheap flight deals from Ontario to Mesa

Keep the following information in mind while searching for Ontario to Mesa flight deals. Data was last updated October 22, 2025.

Round-trip from

$98
(Kiwi.com)

One-way from

$49
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$266
From Ontario to Mesa
Search Deals
One-way flight from Ontario to Mesa
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($27 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 October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Mesa 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 22, 2025.
Use the filters below to find and compare flights from Ontario to Mesa that are best for you.

Fly from

Ontario

Fly to

Mesa

Route

Depart

Return

Price

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 11/5

8:45 am-5:01 pm

1 stop7h 16m

Phoenix Sky Harbor Intl

Thu 11/13

7:01 am-9:10 am

1 stop3h 09m

$150

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 11/14

4:05 pm-12:29 am

1 stop7h 24m

Phoenix Sky Harbor Intl

Mon 11/17

9:17 am-12:51 pm

1 stop4h 34m

$163

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 11/1

12:05 pm-7:47 pm

1 stop7h 42m

Phoenix Sky Harbor Intl

Mon 11/10

9:17 am-9:57 pm

1 stop13h 40m

$170

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 10/29

6:53 am-5:01 pm

1 stop10h 08m

Phoenix Sky Harbor Intl

Fri 10/31

3:31 pm-11:50 pm

1 stop8h 19m

$176

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 10/28

6:53 am-5:01 pm

1 stop10h 08m

Phoenix Sky Harbor Intl

Thu 10/30

6:01 am-12:51 pm

1 stop6h 50m

$176

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 12/6

9:05 am-11:20 am

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 12/8

6:15 pm-6:30 pm

Nonstop1h 15m

$192

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 12/13

10:15 am-4:05 pm

1 stop4h 50m

Phoenix Sky Harbor Intl

Sat 12/13

6:45 pm-7:00 pm

Nonstop1h 15m

$201

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sun 12/14

5:18 pm-8:48 am

1 stop14h 30m

Phoenix Sky Harbor Intl

Thu 12/18

8:26 pm-5:09 pm

1 stop21h 43m

$203

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 12/3

8:40 am-12:40 pm

1 stop3h 00m

Phoenix Sky Harbor Intl

Fri 12/5

6:15 pm-6:30 pm

Nonstop1h 15m

$208

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 10/25

8:34 am-3:23 pm

1 stop6h 49m

Phoenix Sky Harbor Intl

Mon 10/27

5:45 am-11:47 am

1 stop6h 02m

$208

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 23 results
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Best time to book a flight from Ontario to Mesa

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Mesa. Price data was last updated on October 17, 2025.

Booking 71 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Mesa. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Ontario to Mesa (average of $21). Flying from Ontario to Mesa in July is currently the most expensive (average of $82). 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 MS9?

Find hourly flight availability from Ontario to Mesa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 22, 2025.

It’s typically best to fly out from Ontario to Mesa in the evening. Doing so could potentially save you 51% on the flight price compared to flying in the morning, which is usually more expensive.

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

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

Travelers seeking maximum savings on their Ontario to Mesa flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to Mesa

Explore weekly flight availability from Ontario to Mesa. 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 October 22, 2025.

The most flights from ONT to MS9 are scheduled on a Tuesday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Reviews of airlines servicing Mesa

Get insights into the airlines that provide service to Mesa. 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 Mesa. Reviews last updated October 22, 2025.
See what other customers who have flown with Southwest, American Airlines, and Frontier from Ontario to Mesa have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
11,028 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
3,130 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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 Mesa. 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 Mesa?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Mesa. You should not have trouble finding flights to Mesa from Ontario; the airport handles an average of 9 outbound flights to Mesa per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Ontario airport to Mesa. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Mesa?

    A quick flight from Ontario to Mesa can take about 7h 16m. Frontier provides one of the quickest options available for as low as $150. Airlines will cover a distance of 324 mi.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ontario to Mesa on time: American Airlines (83%), SkyWest Airlines (81%), Southwest (75%).

  • What are the cheapest flights from Ontario to Mesa?

    While on average a flight from Ontario to Mesa is generally $770, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Ontario - Phoenix Sky Harbor Intl), you can expect to pay $144 for that flight.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Ontario to Mesa (average of $21). Flying from Ontario to Mesa in July is currently the most expensive (average of $82). 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 Ontario to Mesa

Discover the top 3 airlines that operate flights from Ontario to Mesa. 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 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$159FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$262FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$123Average$300FlexibilityNo cancel feeOn-time71%

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