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$73+ Cheap flights from Austin to Ontario (AUS - 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Austin Bergstrom to Ontario are usually found in September or January, booked 39 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Austin to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Austin (AUS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$143
(Mytrip)

One-way from

$73
(Priceline)

Popular in

December

Cheapest in

September

Average price

$311

Good round-trip deal

$277 or less

Good one-way deal

$128 or less
From Austin Bergstrom to Ontario
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One-way flight from Austin Bergstrom to Ontario
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Austin Bergstrom to Ontario.
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Price to beat on a one-way flight from Austin Bergstrom to Ontario.
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Find flight deals from Austin to Ontario

Cheapest flights from Austin to Ontario
Explore the most affordable flight options available from Austin to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Gotogate deal was found by Cheapflights users on 8/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:30 amAUS - ONT
1 stop15h 24mFrontier
Wed 9/108:59 pmONT - AUS
1 stop24h 33mFrontier
Deal found 8/14$143
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:30 amAUS - ONT
1 stop15h 24mFrontier
Thu 9/113:43 pmONT - AUS
1 stop5h 49mFrontier
Deal found 8/14$144
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/277:55 amAUS - ONT
1 stop17h 55mFrontier
Sat 9/68:00 amONT - AUS
1 stop5h 27mFrontier
Deal found 8/13$145
This Booking.com deal was found by Cheapflights users on 8/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/274:27 pmAUS - ONT
1 stop16h 50mFrontier
Sat 10/48:59 pmONT - AUS
1 stop24h 33mFrontier
Deal found 8/13$146
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/134:27 pmAUS - ONT
1 stop7h 29mFrontier
Mon 9/154:08 pmONT - AUS
1 stop5h 24mFrontier
Deal found 8/14$155
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/242:04 pmAUS - ONT
1 stop23h 47mFrontier
Wed 8/2712:59 amONT - AUS
1 stop20h 17mFrontier
Deal found 8/14$160
This FlightHub deal was found by Cheapflights users on 8/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:00 amAUS - ONT
1 stop5h 51mFrontier
Sun 11/166:11 pmONT - AUS
1 stop24h 42mFrontier
Deal found 8/13$165
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:00 amAUS - ONT
1 stop19h 50mFrontier
Tue 10/218:00 amONT - AUS
1 stop26h 57mFrontier
Deal found 8/14$166
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:45 amAUS - ONT
1 stop18h 05mFrontier
Wed 11/56:53 amONT - AUS
1 stop15h 39mFrontier
Deal found 8/14$171
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:50 amAUS - ONT
1 stop14h 04mFrontier
Sat 9/208:00 amONT - AUS
1 stop5h 27mFrontier
Deal found 8/14$174
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/216:00 amAUS - ONT
1 stop19h 50mFrontier
Wed 8/2712:59 amONT - AUS
1 stop20h 17mFrontier
Deal found 8/13$177

Cheapflights Fare Finder

 
Customize your flight search to find flights from Austin 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 August 14, 2025.
Use the filters below to find and compare flights from Austin to Ontario that are best for you.

Fly from

Austin

Fly to

Ontario

Route

Depart

Return

Price

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Mon 9/8

9:23 pm-7:54 pm

1 stop24h 31m

Ontario

Wed 9/10

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 9/3

7:55 am-7:23 am

1 stop25h 28m

Ontario

Wed 9/10

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 10/3

6:30 am-7:54 pm

1 stop15h 24m

Ontario

Sun 10/5

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 9/4

6:30 am-7:23 am

1 stop26h 53m

Ontario

Wed 9/10

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 9/10

8:00 am-7:54 pm

1 stop13h 54m

Ontario

Sun 9/14

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 9/4

6:30 am-7:23 am

1 stop26h 53m

Ontario

Mon 9/8

4:08 pm-11:32 pm

1 stop5h 24m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 9/12

9:23 pm-7:54 pm

1 stop24h 31m

Ontario

Sun 9/14

8:59 pm-11:32 pm

1 stop24h 33m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 10/1

8:00 am-7:54 pm

1 stop13h 54m

Ontario

Mon 10/6

4:08 pm-11:32 pm

1 stop5h 24m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 9/12

9:23 pm-7:54 pm

1 stop24h 31m

Ontario

Mon 9/15

4:08 pm-8:58 pm

1 stop26h 50m

$143

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 9/13

7:50 am-7:23 am

1 stop25h 33m

Ontario

Tue 9/16

8:59 pm-8:58 pm

1 stop21h 59m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 24 results
1
2
3

The best insider tips for Austin to Ontario flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Austin to Ontario trip
Airports
AUS

Expect long lines at AUS, especially during morning rush hours. Arrive early to avoid delays and enjoy live music performances.

Read more about AUSby Ramsey Qubein
ONT

Consider renting a car at ONT for easy access to Southern California destinations. ONT's rental center offers ten major companies on-site.

Read more about ONTby Bill Fink
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on AUS

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from Austin to Ontario

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

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

Use this chart to determine the optimal time to book a round-trip flight from Austin to Ontario. Price data was last updated on August 8, 2025.

To ensure you get the cheapest price possible for a flight from Austin to Ontario, you should look to book at least 39 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Austin to Ontario (average of $246). Flying from Austin 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 AUS to ONT?

Find hourly flight availability from Austin 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 August 14, 2025.

When flying from Austin to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 21% versus a flight at noon.

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

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

Travelers seeking maximum savings on their Austin to Ontario flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon 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 August 14, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and American Airlines from Austin to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

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.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

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
3,219 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

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 Austin to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Austin to Ontario flight route?

    The Austin Bergstrom to Ontario flight path was viewed by 2 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Austin to Ontario round-trip?

    According to our current data, Frontier ($108), American Airlines ($188), and Delta ($217) offers the cheapest pricing from Austin to Ontario. These flights start at 67% lower than the current average price 3 months from now.

  • What are the cheapest flights from Austin to Ontario?

    The cheapest flight price from Austin to Ontario is $118. On average you can expect to pay $244. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $143.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Austin to Ontario (average of $246). Flying from Austin 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

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See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Austin to Ontario

Discover the top 4 airlines that operate flights from Austin 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$224FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$188Average$357FlexibilityNo cancel feeOn-time71%
DeltaCheapest$217Average$338FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$231Average$378FlexibilityNo cancel feeOn-time63%

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