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$79+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Oct 31 — Nov 71
Fri 10/31
Fri 11/7
1 adult, Economy
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Find cheap flights from Austin to Ontario with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Austin Bergstrom to Ontario are usually found in January or August, 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 October 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$153
(Gotogate)

One-way from

$83
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$333

Good round-trip deal

$442 or less

Good one-way deal

$178 or less
Provider with most accurate pricing for Austin Bergstrom-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Austin Bergstrom-Ontario flights.
Search Deals
From Austin Bergstrom to Ontario
Search Deals
One-way flight from Austin Bergstrom to Ontario
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Austin Bergstrom to Ontario.
Search Deals
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 October 1, 2025.

This Gotogate deal was found by Cheapflights users on 9/29. 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 10/306:00 amAUS - ONT
1 stop7h 10mFrontier
Tue 11/48:45 amONT - AUS
1 stop9h 57mFrontier
Deal found 9/29$153
This Booking.com deal was found by Cheapflights users on 9/29. 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 10/297:45 amAUS - ONT
1 stop18h 05mFrontier
Wed 11/58:45 amONT - AUS
1 stop9h 57mFrontier
Deal found 9/29$154
This Booking.com deal was found by Cheapflights users on 10/1. 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 10/86:00 amAUS - ONT
1 stop19h 50mFrontier
Wed 10/157:15 amONT - AUS
1 stop15h 18mFrontier
Deal found 10/1$172
This Mytrip deal was found by Cheapflights users on 9/29. 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.
Sat 11/87:45 amAUS - ONT
1 stop18h 05mFrontier
Wed 11/128:45 amONT - AUS
1 stop9h 57mFrontier
Deal found 9/29$183
This Frontier deal was found by Cheapflights users on 9/30. 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 11/106:00 amAUS - ONT
1 stop7h 10mFrontier
Fri 11/144:05 pmONT - AUS
1 stop6h 27mFrontier
Deal found 9/30$184
This Booking.com deal was found by Cheapflights users on 9/29. 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.
Tue 10/216:00 amAUS - ONT
1 stop19h 50mFrontier
Thu 10/2310:30 amONT - AUS
1 stop12h 03mFrontier
Deal found 9/29$185
This Frontier deal was found by Cheapflights users on 9/29. 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 11/36:00 amAUS - ONT
1 stop7h 10mFrontier
Wed 11/58:45 amONT - AUS
2 stops21h 57mFrontier
Deal found 9/29$186
This Frontier deal was found by Cheapflights users on 10/1. 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.
Sun 10/266:00 amAUS - ONT
1 stop5h 35mFrontier
Thu 10/3012:05 pmONT - AUS
1 stop10h 27mFrontier
Deal found 10/1$187
This Booking.com deal was found by Cheapflights users on 9/30. 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.
Sun 10/266:00 amAUS - ONT
1 stop5h 35mFrontier
Mon 10/276:53 amONT - AUS
1 stop15h 40mFrontier
Deal found 9/30$188
This Frontier deal was found by Cheapflights users on 9/29. 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.
Thu 10/306:00 amAUS - ONT
1 stop7h 10mFrontier
Mon 11/310:42 pmONT - AUS
2 stops20h 00mFrontier
Deal found 9/29$189
This Booking.com deal was found by Cheapflights users on 9/29. 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.
Tue 10/76:00 amAUS - ONT
1 stop19h 50mFrontier
Thu 10/96:53 amONT - AUS
1 stop15h 40mFrontier
Deal found 9/29$191
This Booking.com deal was found by Cheapflights users on 9/28. 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.
Mon 10/276:00 amAUS - ONT
1 stop19h 50mFrontier
Tue 11/48:45 amONT - AUS
1 stop9h 57mFrontier
Deal found 9/28$192

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 October 1, 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 10/27

6:00 am-11:50 pm

1 stop19h 50m

Ontario

Wed 10/29

6:53 am-12:32 am

1 stop15h 39m

$192

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/21

9:20 am-12:55 pm

1 stop5h 35m

Ontario

Wed 10/22

2:30 pm-10:30 pm

1 stop6h 00m

$262

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/21

5:37 pm-9:24 pm

1 stop5h 47m

Ontario

Wed 10/29

6:38 pm-4:54 am

1 stop8h 16m

$262

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/21

7:15 pm-11:39 pm

1 stop6h 24m

Ontario

Wed 10/29

6:00 am-1:04 pm

1 stop5h 04m

$267

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 10/22

7:15 pm-11:39 pm

1 stop6h 24m

Ontario

Tue 10/28

6:00 am-1:04 pm

1 stop5h 04m

$267

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 11/12

1:41 pm-7:42 pm

1 stop8h 01m

Ontario

Tue 11/18

12:16 pm-9:47 pm

1 stop7h 31m

$267

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 11/11

8:10 am-12:18 pm

1 stop6h 08m

Ontario

Tue 11/18

10:25 pm-9:54 am

1 stop9h 29m

$267

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/21

9:20 am-12:55 pm

1 stop5h 35m

Ontario

Wed 10/29

10:10 am-3:00 pm

Nonstop2h 50m

$269

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/28

7:00 am-3:17 pm

1 stop10h 17m

Ontario

Tue 11/4

6:00 am-6:18 pm

1 stop10h 18m

$282

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 10/21

7:15 pm-11:39 pm

1 stop6h 24m

Ontario

Thu 10/30

7:35 am-5:50 pm

1 stop8h 15m

$299

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/29

Showing 1-10 of 22 results
1
2
3

Compare providers for flights from Austin to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Austin to Ontario in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Austin-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Austin-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Austin-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Austin-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Austin-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 September 26, 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 $327). 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 October 1, 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. Sunday 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 October 1, 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
4,248 reviews

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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
7,961 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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
11,030 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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
3,154 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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.

  • How long is the flight from Austin to Ontario?

    A quick flight from Austin to Ontario can take about 5h 35m. Frontier provides one of the quickest options available for as low as $262. Austin and Ontario are separated by a distance of 1193 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, Frontier ($108), American Airlines ($216), and Delta ($217) offers the cheapest pricing from Austin to Ontario. These flights start at 68% 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 $148. On average you can expect to pay $371. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $153.

  • 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 $327). 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 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 October 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$221FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$414FlexibilityNo cancel feeOn-time71%
DeltaCheapest$217Average$311FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$231Average$383FlexibilityNo cancel feeOn-time63%

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