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$48+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Mesa to Ontario are usually found in July or October, booked 70 days in advance, depart on a Saturday or Tuesday and return on a Friday

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 June 12, 2025.

Round-trip from

$97
(American Airlines)

One-way from

$48
(Southwest)

Popular in

December

Cheapest in

July

Average price

$196
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. 15% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/11. 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 11/42:35 pmPHX - ONT
Nonstop1h 21mAmerican Airlines
Thu 11/61:31 pmONT - PHX
Nonstop1h 19mAmerican Airlines
Deal found 6/11$97
This Southwest deal was found by Cheapflights users on 6/11. 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 8/75:05 amPHX - ONT
1 stop4h 40mSouthwest
Mon 8/119:15 amONT - PHX
Nonstop1h 20mSouthwest
Deal found 6/11$107
This CheapOair deal was found by Cheapflights users on 6/10. 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.
Tue 11/44:56 pmPHX - ONT
1 stop4h 46mFrontier
Thu 11/67:35 pmONT - PHX
1 stop3h 53mFrontier
Deal found 6/10$145

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 June 12, 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

Thu 8/7

3:04 pm-4:24 pm

Nonstop1h 20m

Ontario

Mon 8/11

12:22 pm-1:39 pm

Nonstop1h 17m

$97

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 8/7

5:05 am-9:45 am

1 stop4h 40m

Ontario

Mon 8/11

9:15 am-10:35 am

Nonstop1h 20m

$107

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 9/8

6:00 am-11:47 am

1 stop5h 47m

Ontario

Thu 9/11

7:35 pm-11:28 pm

1 stop3h 53m

$152

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 8/4

6:50 am-8:05 am

Nonstop1h 15m

$48

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 8/12

3:04 pm-4:24 pm

Nonstop1h 20m

$49

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Mon 6/16

6:00 am-11:52 am

1 stop5h 52m

$114

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 8/20

7:00 am-2:09 pm

1 stop7h 09m

$132

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 9/9

7:00 am-6:28 pm

1 stop11h 28m

$193

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 8/26

6:05 am-8:33 pm

2 stops14h 28m

$224

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 7/12

7:20 pm-12:14 pm

2 stops16h 54m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 June 9, 2025.

The best time to book flights from Mesa to Ontario is 70 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 June 12, 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 Tuesday at noon when fares are most often at their lowest. Sunday mornings 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 June 12, 2025.

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

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
To help decide which airline to fly from Mesa to Ontario, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $49 while deals on Frontier start at $119 one-way.

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

    Consider American Airlines (84%), Envoy Air (83%) or British Airways (80%) 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 $89. On average you can expect to pay $226. 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.

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$110FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$120Average$278FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$128Average$262FlexibilityNo cancel feeOn-time63%

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