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Mesa

$63+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHX
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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Find cheap flights from Ontario to Mesa with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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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 Wednesday

Cheap 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 March 17, 2026.

This Southwest deal was found by Cheapflights users on 3/15. 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 4/1612:40 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Thu 4/235:40 pm
PHX
-
ONT
1 stop4h 20m
Southwest
Deal found 3/15$147
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/173:55 pm
ONT
-
PHX
2 stops5h 20m
Southwest
Mon 4/207:30 am
PHX
-
ONT
Nonstop1h 15m
Southwest
Deal found 3/13$152
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/31:00 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Sat 4/410:50 pm
PHX
-
ONT
1 stop8h 15m
Southwest
Deal found 3/13$153
This Southwest deal was found by Cheapflights users on 3/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/25:40 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Mon 4/610:55 pm
PHX
-
ONT
Nonstop1h 15m
Southwest
Deal found 3/12$157
This Southwest deal was found by Cheapflights users on 3/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/153:45 pm
ONT
-
PHX
2 stops5h 25m
Southwest
Tue 4/218:30 am
PHX
-
ONT
1 stop3h 05m
Southwest
Deal found 3/14$158
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/210:27 pm
ONT
-
PHX
1 stop11h 21m
Frontier
Mon 4/68:27 pm
PHX
-
ONT
1 stop17h 59m
Frontier
Deal found 3/12$159
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/203:45 pm
ONT
-
PHX
2 stops5h 25m
Southwest
Sat 5/237:05 pm
PHX
-
ONT
Nonstop1h 10m
Southwest
Deal found 3/13$163
This American Airlines deal was found by Cheapflights users on 3/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/177:35 pm
ONT
-
PHX
Nonstop1h 21m
American Airlines
Tue 4/213:04 pm
PHX
-
ONT
Nonstop1h 18m
American Airlines
Deal found 3/12$165
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:33 pm
ONT
-
PHX
1 stop15h 05m
Frontier
Mon 5/45:08 pm
PHX
-
ONT
1 stop26h 24m
Frontier
Deal found 3/13$171
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:27 pm
ONT
-
PHX
1 stop11h 21m
Frontier
Mon 4/138:39 pm
PHX
-
ONT
1 stop14h 05m
Frontier
Deal found 3/13$172

Find flight deals from Ontario to Mesa

Keep the following information in mind while searching for Ontario to Mesa flight deals. Data was last updated March 17, 2026.

Round-trip from

$147
(Southwest)

One-way from

$63
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$328
From Ontario to Mesa
Search Deals
One-way flight from Ontario to Mesa
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 17, 2026.
Use the filters below to find and compare flights from Ontario to Mesa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 5/20

12:40 pm-2:00 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Wed 5/27

6:05 am-10:25 am

1 stop4h 20m

$147

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 5/5

12:10 pm-5:10 pm

1 stop5h 00m

Phoenix Sky Harbor Intl

Fri 5/8

8:05 pm-9:15 pm

Nonstop1h 10m

$147

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 4/7

12:30 pm-5:35 pm

2 stops5h 05m

Phoenix Sky Harbor Intl

Fri 4/10

7:30 am-8:45 am

Nonstop1h 15m

$152

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 4/16

6:50 pm-10:55 pm

1 stop4h 05m

Phoenix Sky Harbor Intl

Thu 4/23

5:45 am-11:20 am

1 stop5h 35m

$157

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 4/4

9:45 pm-7:00 am

1 stop9h 15m

Phoenix Sky Harbor Intl

Mon 4/6

7:40 pm-11:35 pm

1 stop3h 55m

$162

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 4/11

5:30 am-10:15 am

1 stop4h 45m

Phoenix Sky Harbor Intl

Sat 4/18

12:35 pm-7:20 pm

2 stops6h 45m

$162
Quickest round-trip

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 4/4

6:10 pm-7:30 pm

Nonstop1h 20m

Phoenix Sky Harbor Intl

Fri 4/10

9:55 pm-11:05 pm

Nonstop1h 10m

$178

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 4/28

3:45 pm-9:10 pm

2 stops5h 25m

Phoenix Sky Harbor Intl

Wed 5/6

2:50 pm-8:50 pm

2 stops6h 00m

$224

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 4/22

12:30 pm-5:05 pm

1 stop4h 35m

Phoenix Sky Harbor Intl

Wed 4/29

2:50 pm-8:50 pm

2 stops6h 00m

$229
Cheapest one-way
Quickest one-way

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 4/10

6:00 pm-7:15 pm

Nonstop1h 15m

$69

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

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 March 13, 2026.

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 $39). 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 March 17, 2026.

It’s typically best to fly out from Ontario to Mesa at noon. Doing so could potentially save you 16% on the flight price compared to flying in the evening, 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 March 14, 2026.

Travelers seeking maximum savings on their Ontario to Mesa flight should consider departing on Saturday at noon 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 March 17, 2026.

The most flights from ONT to MS9 are scheduled on a Monday (15 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 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 March 17, 2026.
See what other customers who have flown with Southwest,JetBlue, andAmerican Airlines 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
4,321 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,321 reviews
Southwest
8.0
Very good
4,321 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
JetBlue
7.2
Good
2,906 reviews
Southwest
8.0
Very good
4,321 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.1
Good
11,467 reviews
Southwest
8.0
Very good
4,321 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.7
Fair
3,025 reviews
Southwest
8.0
Very good
4,321 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 12 outbound flights to Mesa per day. You should also have plenty of airline options to choose from since 4 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 1h 20m. Southwest provides one of the quickest options available for as low as $147. Airlines will cover a distance of 324 mi. Generally, flights for this route are nonstop.

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

    $48 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on American Airlines and Frontier, with prices starting from $58 and $66, respectively.

  • 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: Porter Airlines (93%), Southwest (87%), American Airlines (84%).

  • What are the cheapest flights from Ontario to Mesa?

    While on average a flight from Ontario to Mesa is generally $656, our data shows the cheapest flight currently is $134. When looking at the most popular route, (Ontario - Phoenix Sky Harbor Intl), you can expect to pay $117 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 $39). 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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Alternative routes for Ontario to Mesa

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Ontario to Mesa

Discover the top 4 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 March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$168FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$267FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$124Average$307FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$228Average$308FlexibilityNo cancel feeOn-time62%

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