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$64+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ONT
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
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 Wednesday or Thursday 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 December 15, 2025.

This Expedia deal was found by Cheapflights users on 12/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2810:26 pmPHX - ONT
1 stop23h 51mFrontier
Mon 2/211:27 amONT - PHX
1 stop4h 48mFrontier
Deal found 12/12$152
This CheapOair deal was found by Cheapflights users on 12/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2710:46 pmPHX - ONT
1 stop19h 56mFrontier
Wed 2/117:17 pmONT - PHX
1 stop17h 07mFrontier
Deal found 12/12$159
This Frontier deal was found by Cheapflights users on 12/12. 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.
Tue 12/239:58 amPHX - ONT
1 stop8h 24mFrontier
Thu 1/810:18 pmONT - PHX
1 stop9h 40mFrontier
Deal found 12/12$162
This Frontier deal was found by Cheapflights users on 12/12. 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.
Wed 12/249:58 amPHX - ONT
1 stop8h 17mFrontier
Sat 12/276:00 amONT - PHX
1 stop3h 40mFrontier
Deal found 12/12$163
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop8h 24mFrontier
Sat 12/276:00 amONT - PHX
1 stop3h 40mFrontier
Deal found 12/11$170
This Super.com deal was found by Cheapflights users on 12/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/249:58 amPHX - ONT
1 stop12h 19mFrontier
Fri 12/265:54 pmONT - PHX
1 stop15h 46mFrontier
Deal found 12/11$171
This Expedia deal was found by Cheapflights users on 12/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop12h 19mFrontier
Tue 12/306:00 amONT - PHX
1 stop25h 48mFrontier
Deal found 12/14$174
This Expedia deal was found by Cheapflights users on 12/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:58 amPHX - ONT
1 stop12h 19mFrontier
Fri 1/25:54 pmONT - PHX
1 stop14h 46mFrontier
Deal found 12/12$175
This Booking.com deal was found by Cheapflights users on 12/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:26 pmPHX - ONT
1 stop19h 56mFrontier
Fri 1/25:54 pmONT - PHX
1 stop14h 46mFrontier
Deal found 12/12$177
This Super.com deal was found by Cheapflights users on 12/14. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/229:58 amPHX - ONT
1 stop12h 19mFrontier
Mon 12/296:00 pmONT - PHX
1 stop13h 48mFrontier
Deal found 12/14$188

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 December 15, 2025.

Round-trip from

$128
(Frontier)

One-way from

$64
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$305
From Mesa to Ontario
Search Deals
One-way flight from Mesa to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($41 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 December 2025
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 December 15, 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 2/21

3:05 pm-7:14 pm

1 stop5h 09m

Ontario

Sun 2/22

10:18 pm-9:10 am

1 stop9h 52m

$128

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 1/6

7:00 am-10:05 am

1 stop4h 05m

Ontario

Thu 1/8

3:20 pm-5:40 pm

Nonstop1h 20m

$154

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Thu 3/5

5:05 am-2:29 pm

1 stop10h 24m

Ontario

Mon 3/9

4:14 pm-11:57 pm

1 stop7h 43m

$162

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 1/6

6:05 pm-6:20 pm

Nonstop1h 15m

Ontario

Thu 1/8

7:30 pm-9:51 pm

Nonstop1h 21m

$171

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 12/23

9:58 am-9:17 pm

1 stop12h 19m

Ontario

Fri 1/2

5:54 pm-9:40 am

1 stop14h 46m

$175

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 2/14

9:10 am-9:30 am

Nonstop1h 20m

Ontario

Tue 2/17

5:40 am-10:05 am

1 stop3h 25m

$181

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 1/13

4:15 pm-8:20 pm

2 stops5h 05m

Ontario

Tue 1/20

5:55 am-8:10 am

Nonstop1h 15m

$186

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 1/9

10:21 pm-2:26 pm

1 stop17h 05m

Ontario

Sun 1/11

10:18 pm-8:06 am

2 stops8h 48m

$190

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Fri 1/30

6:25 pm-12:20 am

1 stop6h 55m

Ontario

Mon 2/2

3:22 pm-8:07 pm

1 stop3h 45m

$198

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Sat 12/20

7:00 am-4:31 pm

1 stop10h 31m

Ontario

Mon 12/22

6:00 am-9:16 pm

1 stop14h 16m

$213

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 22 results
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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 December 12, 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 $25). 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 December 15, 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 32% 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. Sunday 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 December 15, 2025.

The most flights from MS9 to ONT are scheduled on a Sunday (13 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 December 15, 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
7.9
Good
4,250 reviews

Boarding

8.1

Comfort

8.0

Overall

7.9

Entertainment

7.5

Crew

8.6

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
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Comfort

8.0

Overall

7.9

Entertainment

7.5

Crew

8.6

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
7.2
Good
11,051 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Comfort

8.0

Overall

7.9

Entertainment

7.5

Crew

8.6

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
5.8
Fair
3,081 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Comfort

8.0

Overall

7.9

Entertainment

7.5

Crew

8.6

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 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 15m. Frontier provides one of the quickest options available for as low as $171. 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. Frontier flights start at $54 while deals on American Airlines start at $63 one-way.

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

    Consider SkyWest Airlines (100%), British Airways (85%) or American Airlines (75%) 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 $115. On average you can expect to pay $292. The most popular route, (Phoenix Sky Harbor Intl - Ontario), can usually be booked for $148.

  • 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 $25). 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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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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$158FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$97Average$280FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$269FlexibilityNo cancel feeOn-time63%

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