HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$49+ 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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Mesa to Ontario 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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Mesa to Ontario are usually found in August or October, booked 74 days in advance, depart on a Saturday 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 September 14, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(American Airlines)

Popular in

December

Cheapest in

August

Average price

$209
From Mesa to Ontario
Search Deals
One-way flight from Mesa to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 14, 2025.

This Southwest deal was found by Cheapflights users on 9/13. 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.
Sat 10/117:40 pmPHX - ONT
Nonstop1h 10mSouthwest
Wed 10/152:20 pmONT - PHX
Nonstop1h 20mSouthwest
Deal found 9/13$97
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 10/97:41 amPHX - ONT
Nonstop1h 15mAmerican Airlines
Mon 10/136:15 amONT - PHX
Nonstop1h 18mAmerican Airlines
Deal found 9/12$98
This Southwest deal was found by Cheapflights users on 9/14. 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.
Sat 10/189:00 amPHX - ONT
Nonstop1h 25mSouthwest
Mon 10/205:10 pmONT - PHX
1 stop4h 40mSouthwest
Deal found 9/14$107
This Southwest deal was found by Cheapflights users on 9/14. 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.
Thu 10/163:55 pmPHX - ONT
1 stop4h 35mSouthwest
Mon 10/205:10 pmONT - PHX
1 stop4h 40mSouthwest
Deal found 9/14$117
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Sat 9/2012:52 pmPHX - ONT
1 stop9h 04mFrontier
Mon 9/222:45 pmONT - PHX
1 stop7h 57mFrontier
Deal found 9/13$119
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:10 pmPHX - ONT
Nonstop1h 14mAmerican Airlines
Fri 10/177:27 pmONT - PHX
Nonstop1h 20mAmerican Airlines
Deal found 9/13$127
This Southwest deal was found by Cheapflights users on 9/13. 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 10/177:40 amPHX - ONT
Nonstop1h 20mSouthwest
Mon 10/205:20 amONT - PHX
Nonstop1h 10mSouthwest
Deal found 9/13$134
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/109:58 pmPHX - ONT
1 stop14h 39mFrontier
Mon 10/1310:47 pmONT - PHX
1 stop13h 19mFrontier
Deal found 9/13$135
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 9/184:59 pmPHX - ONT
1 stop6h 39mFrontier
Mon 9/222:45 pmONT - PHX
1 stop7h 57mFrontier
Deal found 9/12$138
This Frontier deal was found by Cheapflights users on 9/12. 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.
Mon 9/2910:31 amPHX - ONT
1 stop3h 29mFrontier
Mon 9/294:08 pmONT - PHX
1 stop7h 49mFrontier
Deal found 9/12$139

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 September 14, 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

Sat 10/18

7:40 pm-8:50 pm

Nonstop1h 10m

Ontario

Mon 10/20

5:20 am-6:30 am

Nonstop1h 10m

$97

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 10/11

7:40 pm-8:50 pm

Nonstop1h 10m

Ontario

Wed 10/15

2:20 pm-3:40 pm

Nonstop1h 20m

$97

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 10/23

4:05 pm-5:20 pm

Nonstop1h 15m

Ontario

Tue 10/28

7:15 pm-8:35 pm

Nonstop1h 20m

$97

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 10/17

7:40 am-9:00 am

Nonstop1h 20m

Ontario

Mon 10/20

5:20 am-6:30 am

Nonstop1h 10m

$134

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 11/4

6:11 pm-11:50 pm

1 stop6h 39m

Ontario

Thu 11/6

12:05 pm-7:33 pm

1 stop6h 28m

$144

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 10/2

6:00 am-11:38 am

1 stop5h 38m

Ontario

Fri 10/3

7:30 pm-10:42 pm

1 stop3h 12m

$144

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sun 10/5

7:40 am-3:24 pm

1 stop7h 44m

Ontario

Wed 10/8

6:53 am-3:04 pm

1 stop8h 11m

$144

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 11/18

3:49 pm-4:03 pm

Nonstop1h 14m

$49

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 12/8

9:00 am-9:15 am

Nonstop1h 15m

$49

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 11/27

11:45 am-12:05 pm

Nonstop1h 20m

$49

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 15 results
1
2

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 September 12, 2025.

The best time to book flights from Mesa to Ontario is 74 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, August is the cheapest month in which you can book a flight from Mesa to Ontario (average of $246). Flying from Mesa to Ontario in March is currently the most expensive (average of $328). 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 September 14, 2025.

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

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 Saturday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Mesa to Ontario

Explore weekly flight availability from Mesa 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 September 14, 2025.

The most flights from MS9 to ONT are scheduled on a Thursday (11 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 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 September 14, 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
4,245 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

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
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

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
10,000 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

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
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

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 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 7 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 1h 10m. Southwest provides one of the quickest options available for as low as $97. The distance between Mesa and Ontario is about 324 mi. All flights are typically nonstop.

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

    Consider SkyWest Airlines (88%), American Airlines (85%) or Southwest (79%) 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 $48. On average you can expect to pay $185. The most popular route, (Phoenix Sky Harbor Intl - Ontario), can usually be booked for $97.

  • 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, August is the cheapest month in which you can book a flight from Mesa to Ontario (average of $246). Flying from Mesa to Ontario in March is currently the most expensive (average of $328). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Mesa to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Sky Harbor Intl to Las Vegas flights
Sky Harbor Intl to Los Angeles flights
Sky Harbor Intl to San Francisco flights
Sky Harbor Intl to Santa Ana flights
Las Vegas to Los Angeles flights
Sky Harbor Intl to Ontario flights
Sky Harbor Intl to San Diego flights
Las Vegas to Santa Ana flights
Tucson to Las Vegas flights
Las Vegas to Burbank flights
Las Vegas to Ontario flights
Las Vegas to San Francisco flights
Las Vegas to San Diego flights
Sky Harbor Intl to Burbank flights
Las Vegas to Reno flights
Sky Harbor Intl to Sacramento flights
Las Vegas to Oakland flights
Sky Harbor Intl to San Jose flights
Tucson to San Francisco flights
Tucson to Los Angeles flights
Tucson to San Diego flights
Las Vegas to San Jose flights
Sky Harbor Intl to Reno flights
Sky Harbor Intl to Fresno flights
Phoenix-Mesa Gateway to Las Vegas flights
Sky Harbor Intl to Santa Barbara flights
Sky Harbor Intl to Oakland flights
Las Vegas to Sacramento flights
Las Vegas to Long Beach flights
Sky Harbor Intl to Monterey flights
Tucson to Santa Ana flights
Las Vegas to Santa Rosa flights
Tucson to Ontario flights
Sky Harbor Intl to Medford flights
Sky Harbor Intl to San Luis Obispo flights
Sky Harbor Intl to Long Beach flights
Las Vegas to Fresno flights
Tucson to San Jose flights
Sky Harbor Intl to Santa Rosa flights
Las Vegas to Palm Springs flights
Sky Harbor Intl to Palm Springs flights
Las Vegas to Stockton flights
Las Vegas to Santa Barbara flights
Tucson to Sacramento flights
Sky Harbor Intl to Bakersfield flights
Tucson to Oakland flights
Las Vegas to Monterey flights
Tucson to Burbank flights
Flagstaff to Los Angeles flights
Tucson to Fresno flights

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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$56Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$271FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$105Average$265FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.