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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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Apr 15 — Apr 221
Wed 4/15
Wed 4/22
1 adult, Economy
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1. Tell us where you want to go

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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 Wednesday or Saturday and return on a Wednesday

Cheap 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 March 16, 2026.

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.
Tue 4/78:20 pm
PHX
-
ONT
Nonstop1h 10m
Southwest
Wed 4/810:30 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/12$97
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.
Tue 4/212:05 pm
PHX
-
ONT
1 stop4h 44m
Frontier
Wed 4/227:44 pm
ONT
-
PHX
1 stop4h 05m
Frontier
Deal found 3/13$124
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.
Mon 4/69:10 pm
PHX
-
ONT
Nonstop1h 15m
Southwest
Wed 4/1510:30 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/12$127
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.
Mon 4/68:27 pm
PHX
-
ONT
1 stop15h 42m
Frontier
Wed 4/1511:44 am
ONT
-
PHX
1 stop12h 05m
Frontier
Deal found 3/12$129
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.
Mon 4/136:45 am
PHX
-
ONT
1 stop13h 22m
Frontier
Tue 4/147:44 pm
ONT
-
PHX
1 stop4h 05m
Frontier
Deal found 3/12$142
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.
Sat 4/184:20 pm
PHX
-
ONT
1 stop4h 25m
Southwest
Mon 4/208:10 am
ONT
-
PHX
Nonstop1h 15m
Southwest
Deal found 3/14$147
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.
Sat 4/410:50 pm
PHX
-
ONT
1 stop8h 15m
Southwest
Fri 4/1712:40 pm
ONT
-
PHX
Nonstop1h 20m
Southwest
Deal found 3/14$153

Find flight deals from Mesa to Ontario

Keep the following information in mind while searching for Mesa to Ontario flight deals. Data was last updated March 16, 2026.

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

November

Cheapest in

September

Average price

$283
From Mesa to Ontario
Search Deals
One-way flight from Mesa to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($12 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 March 2026
Search Deals

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 March 16, 2026.
Use the filters below to find and compare flights from Mesa to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 4/14

3:55 pm-7:40 pm

1 stop3h 45m

Ontario

Thu 4/16

3:00 pm-4:20 pm

Nonstop1h 20m

$147

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 5/28

5:05 pm-11:05 pm

1 stop6h 00m

Ontario

Mon 6/1

12:40 pm-2:00 pm

Nonstop1h 20m

$167

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 4/8

3:04 pm-4:22 pm

Nonstop1h 18m

Ontario

Thu 4/9

7:35 pm-8:56 pm

Nonstop1h 21m

$238

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 4/6

8:20 am-2:30 pm

2 stops6h 10m

Ontario

Wed 4/15

3:45 pm-9:10 pm

2 stops5h 25m

$264

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 5/22

2:05 pm-8:05 pm

1 stop6h 00m

Ontario

Tue 5/26

3:45 pm-9:10 pm

2 stops5h 25m

$271
Quickest round-trip

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 3/31

7:00 pm-8:15 pm

Nonstop1h 15m

Ontario

Mon 4/6

5:40 am-6:55 am

Nonstop1h 15m

$275

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 4/1

2:40 pm-3:55 pm

Nonstop1h 15m

Ontario

Tue 4/7

3:45 pm-5:05 pm

Nonstop1h 20m

$275

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 4/3

11:20 am-12:40 pm

Nonstop1h 20m

Ontario

Mon 4/6

5:25 pm-6:45 pm

Nonstop1h 20m

$275
Cheapest one-way

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 4/1

4:50 pm-9:05 pm

1 stop4h 15m

$59
Quickest one-way

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 5/11

8:05 pm-9:15 pm

Nonstop1h 10m

$69

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/11

Showing 1-10 of 18 resultsSorted by cheapest first
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 March 13, 2026.

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 $46). Flying from Mesa to Ontario in June 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 March 16, 2026.

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 evening tend to be the most expensive. A flight at noon could potentially save you up to 11% 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 March 14, 2026.

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. Thursday 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 March 16, 2026.

The most flights from MS9 to ONT are scheduled on a Monday (12 on average). You will have fewer flight options on Wednesday, 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 March 16, 2026.
Peruse reviews from past customers who have flown with Southwest,American Airlines, andFrontier 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
4,318 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

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
4,318 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

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
7.1
Good
11,465 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

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
5.7
Fair
3,030 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

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 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 9 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 18m. Southwest provides one of the quickest options available for as low as $238. The distance between Mesa and Ontario is about 324 mi. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $48. American Airlines flights start at $58 while deals on Frontier start at $67 one-way.

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

    Consider British Airways (89%), American Airlines (86%) or Porter Airlines (82%) 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 $248. The most popular route, (Phoenix Sky Harbor Intl - Ontario), can usually be booked for $137.

  • 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 $46). Flying from Mesa to Ontario in June 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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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 March 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$174FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$273FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$263FlexibilityNo cancel feeOn-time63%

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