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Ontario

$54+ Cheap flights from Mesa, AZ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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Cheapflights Tip: The best prices from Mesa to Ontario are usually found in September or August, booked 85 days in advance, depart on a Sunday or Monday and return on a Wednesday

Cheap flight deals from Mesa to Ontario

Keep the following information in mind while searching for Mesa to Ontario flight deals. Data was last updated October 29, 2025.

Round-trip from

$110
(Frontier)

One-way from

$54
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$197
From Mesa to Ontario
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One-way flight from Mesa to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Mesa to Ontario

Cheapest flights from Mesa to Ontario
Explore the most affordable flight options available from Mesa to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:00 pmPHX - ONT
1 stop10h 17mFrontier
Mon 11/171:46 pmONT - PHX
1 stop8h 17mFrontier
Deal found 10/28$110
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Tue 12/97:43 pmPHX - ONT
1 stop26h 34mFrontier
Tue 12/166:15 amONT - PHX
1 stop11h 16mFrontier
Deal found 10/28$111
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/119:05 pmPHX - ONT
1 stop25h 24mFrontier
Tue 11/188:45 amONT - PHX
1 stop7h 16mFrontier
Deal found 10/28$116
This Booking.com deal was found by Cheapflights users on 10/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:00 amPHX - ONT
1 stop5h 09mFrontier
Mon 12/85:18 pmONT - PHX
1 stop24h 13mFrontier
Deal found 10/27$117
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/34:32 pmPHX - ONT
1 stop19h 37mFrontier
Thu 12/410:12 pmONT - PHX
1 stop24h 43mFrontier
Deal found 10/27$122
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/69:16 amPHX - ONT
1 stop6h 09mFrontier
Mon 12/86:15 amONT - PHX
2 stops10h 17mFrontier
Deal found 10/29$129
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1111:38 amPHX - ONT
1 stop10h 04mFrontier
Wed 11/128:45 amONT - PHX
1 stop12h 13mFrontier
Deal found 10/28$130
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/259:58 amPHX - ONT
1 stop8h 24mFrontier
Mon 1/52:45 pmONT - PHX
1 stop8h 05mFrontier
Deal found 10/29$131
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Wed 12/37:43 pmPHX - ONT
1 stop19h 21mFrontier
Sun 12/72:59 pmONT - PHX
1 stop8h 32mFrontier
Deal found 10/28$132
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/249:58 amPHX - ONT
1 stop8h 17mFrontier
Thu 1/16:45 amONT - PHX
1 stop16h 44mFrontier
Deal found 10/29$133
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/137:01 amPHX - ONT
1 stop3h 09mFrontier
Thu 11/206:30 amONT - PHX
1 stop14h 08mFrontier
Deal found 10/27$136
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 12/2511:30 amPHX - ONT
2 stops10h 47mFrontier
Wed 1/78:00 amONT - PHX
1 stop12h 06mFrontier
Deal found 10/29$140

Cheapflights Fare Finder

 
Customize your flight search to find flights from Mesa 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 October 29, 2025.
Use the filters below to find and compare flights from Mesa to Ontario that are best for you.

Fly from

Mesa

Fly to

Ontario

Route

Depart

Return

Price

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 1/20

3:38 pm-9:17 pm

1 stop6h 39m

Ontario

Sat 1/31

8:30 am-2:33 pm

1 stop5h 03m

$133

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 11/7

10:53 am-6:28 pm

1 stop8h 35m

Ontario

Tue 11/11

8:45 am-4:06 pm

1 stop6h 21m

$143

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 11/14

12:55 pm-11:50 pm

1 stop11h 55m

Ontario

Wed 11/19

8:45 am-5:01 pm

1 stop7h 16m

$143

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 12/24

9:58 am-5:15 pm

1 stop8h 17m

Ontario

Mon 1/5

6:00 am-4:54 pm

2 stops9h 54m

$151

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 1/15

2:10 pm-9:21 pm

1 stop8h 11m

Ontario

Mon 1/19

10:12 pm-2:33 pm

2 stops15h 21m

$163

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 11/9

7:01 am-7:17 am

1 stop25h 16m

Ontario

Sun 11/16

4:15 pm-12:13 am

1 stop6h 58m

$182

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 11/1

2:10 pm-8:42 pm

1 stop6h 32m

Ontario

Sun 11/16

4:15 pm-12:13 am

1 stop6h 58m

$202

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 11/2

9:35 am-12:51 pm

1 stop4h 16m

Ontario

Fri 11/7

4:05 pm-12:29 am

1 stop7h 24m

$202

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 1/15

8:48 am-9:08 am

Nonstop1h 20m

Ontario

Mon 1/19

4:45 pm-7:06 pm

Nonstop1h 21m

$231

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 12/6

2:45 pm-3:00 pm

Nonstop1h 15m

Ontario

Mon 12/8

6:30 pm-8:50 pm

Nonstop1h 20m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 23 results
1
2
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Best time to book a flight from Mesa to Ontario

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

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

Use this chart to determine the optimal time to book a round-trip flight from Mesa to Ontario. Price data was last updated on October 24, 2025.

The best time to book flights from Mesa to Ontario is 85 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from Mesa to Ontario (average of $24). Flying from Mesa 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 MS9 to ONT?

Find hourly flight availability from Mesa 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 October 29, 2025.

One of the essential ways to save on airfare from Mesa to Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 34% on airfare.

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

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

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

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 October 29, 2025.
Peruse reviews from past customers who have flown with Southwest, American Airlines, and Frontier from Mesa to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

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
11,032 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

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
3,124 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

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 Mesa 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 Mesa?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Mesa. On average, Ontario has 4 inbound flights from Mesa per day from 3 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Mesa to Ontario?

    A quick flight from Mesa to Ontario can take about 6h 39m. Frontier provides one of the quickest options available for as low as $133. The distance between Mesa and Ontario is about 324 mi.

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

    Consider SkyWest Airlines (91%), American Airlines (84%) or British Airways (78%) when booking your flight. These represent the most reliable airlines when flying from Mesa to Ontario.

  • What are the cheapest flights from Mesa to Ontario?

    The cheapest flight price from Mesa to Ontario is $107. On average you can expect to pay $308. The most popular route, (Phoenix Sky Harbor Intl - Ontario), can usually be booked for $110.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Mesa to Ontario (average of $24). Flying from Mesa 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.

See more FAQs

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

Discover the top 3 airlines that operate flights from Mesa 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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$276FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$98Average$273FlexibilityNo cancel feeOn-time63%

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