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$61+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
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 Austin Bergstrom to Ontario are usually found in August or July, booked 76 days in advance, depart on a Saturday or Tuesday and return on a Wednesday

Cheap 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 December 30, 2025.

This Delta deal was found by Cheapflights users on 12/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:20 pmAUS - ONT
1 stop6h 34mDelta
Fri 1/96:00 amONT - AUS
1 stop5h 45mDelta
Deal found 12/27$451
This American Airlines deal was found by Cheapflights users on 12/27. 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 12/302:29 pmAUS - ONT
1 stop5h 59mAmerican Airlines
Tue 1/66:22 amONT - AUS
2 stops7h 47mAmerican Airlines
Deal found 12/27$456
This United Airlines deal was found by Cheapflights users on 12/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3012:15 pmAUS - ONT
2 stops12h 26mUnited Airlines
Fri 1/210:42 amONT - AUS
2 stops11h 14mUnited Airlines
Deal found 12/29$461
This Alaska Airlines deal was found by Cheapflights users on 12/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:46 pmAUS - ONT
1 stop8h 13mAlaska Airlines
Mon 1/56:05 pmONT - AUS
1 stop8h 55mAlaska Airlines
Deal found 12/28$470
This Delta deal was found by Cheapflights users on 12/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:20 pmAUS - ONT
1 stop6h 34mDelta
Wed 1/710:30 pmONT - AUS
1 stop9h 21mDelta
Deal found 12/28$471
This Alaska Airlines deal was found by Cheapflights users on 12/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:40 amAUS - ONT
1 stop10h 02mAlaska Airlines
Mon 1/56:05 pmONT - AUS
1 stop8h 55mAlaska Airlines
Deal found 12/28$491
This Alaska Airlines deal was found by Cheapflights users on 12/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:46 pmAUS - ONT
1 stop8h 13mAlaska Airlines
Fri 1/26:05 pmONT - AUS
1 stop8h 55mAlaska Airlines
Deal found 12/29$510
This Southwest deal was found by Cheapflights users on 12/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:30 pmAUS - ONT
1 stop6h 00mSouthwest
Fri 1/25:55 amONT - AUS
1 stop5h 15mSouthwest
Deal found 12/28$524
This United Airlines deal was found by Cheapflights users on 12/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:59 pmAUS - ONT
1 stop5h 53mUnited Airlines
Wed 12/311:40 pmONT - AUS
1 stop8h 16mUnited Airlines
Deal found 12/29$531
This United Airlines deal was found by Cheapflights users on 12/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:55 pmAUS - ONT
2 stops9h 46mUnited Airlines
Tue 1/65:05 amONT - AUS
2 stops8h 19mUnited Airlines
Deal found 12/27$534
This United Airlines deal was found by Cheapflights users on 12/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:59 pmAUS - ONT
1 stop5h 53mUnited Airlines
Fri 1/96:39 pmONT - AUS
2 stops11h 51mUnited Airlines
Deal found 12/27$536

Find 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 December 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$130
(Kiwi.com)

One-way from

$61
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$492

Good round-trip deal

$438 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. 10% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Austin Bergstrom to Ontario.
Search Deals

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 December 30, 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

Wed 1/28

10:40 am-3:07 pm

1 stop6h 27m

Ontario

Mon 2/2

6:20 am-7:30 pm

1 stop11h 10m

$134

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 1/29

2:41 pm-7:53 pm

1 stop7h 12m

Ontario

Mon 2/2

3:22 pm-10:40 pm

2 stops29h 18m

$162

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 2/20

10:16 am-11:59 pm

1 stop15h 43m

Ontario

Sun 2/22

2:08 pm-9:21 am

1 stop17h 13m

$200

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Mon 2/2

3:33 pm-1:37 pm

1 stop24h 04m

Ontario

Wed 2/4

3:07 pm-1:46 pm

1 stop20h 39m

$201

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 1/30

8:22 pm-12:20 am

1 stop5h 58m

Ontario

Mon 2/2

6:20 am-7:30 pm

1 stop11h 10m

$201

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sun 2/1

8:15 pm-12:20 am

1 stop6h 05m

Ontario

Mon 2/2

6:20 am-7:30 pm

1 stop11h 10m

$250

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 3/7

7:59 pm-12:11 pm

1 stop18h 12m

Ontario

Wed 3/11

6:15 am-12:16 am

1 stop16h 01m

$251

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 2/10

5:39 pm-1:06 pm

1 stop21h 27m

Ontario

Sat 2/14

4:02 pm-2:35 pm

1 stop20h 33m

$304

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 1/28

1:50 pm-3:05 pm

Nonstop3h 15m

Ontario

Wed 2/4

6:05 am-12:25 pm

1 stop4h 20m

$339

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Mon 3/9

7:15 am-11:32 pm

1 stop18h 17m

Ontario

Fri 3/13

6:14 am-2:35 pm

1 stop30h 21m

$345

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 18 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Austin-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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 December 26, 2025.

To ensure you get the cheapest price possible for a flight from Austin to Ontario, you should look to book at least 76 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, September is the cheapest month in which you can book a flight from Austin to Ontario (average of $60). Flying from Austin to Ontario in March is currently the most expensive (average of $107). 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 December 30, 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 evening, which can drop the price by up to 29% versus a flight in the morning.

The best insider tips for Austin to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
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

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 30, 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
4,251 reviews

Crew

8.6

Overall

8.0

Food

7.0

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
4,251 reviews
Southwest
8.0
Very good
4,251 reviews

Crew

8.6

Overall

8.0

Food

7.0

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
7.9
Good
8,016 reviews
Southwest
8.0
Very good
4,251 reviews

Crew

8.6

Overall

8.0

Food

7.0

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
11,074 reviews
Southwest
8.0
Very good
4,251 reviews

Crew

8.6

Overall

8.0

Food

7.0

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
5.7
Fair
3,066 reviews
Southwest
8.0
Very good
4,251 reviews

Crew

8.6

Overall

8.0

Food

7.0

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.

  • What airports do I use to fly from Austin to Ontario?

    If you wish to fly to Ontario from Austin, then you need to book flights from Austin Bergstrom to Ontario. There is 1 flight from Austin Bergstrom (AUS) to Ontario (ONT) per day to choose from. Flights to Ontario from Austin Bergstrom are available from 4 different airlines, which means you should have some options if you want to compare airfare deals. 2h 55m is how long a nonstop flight from Austin to Ontario typically takes.

  • How popular is this Austin to Ontario flight route?

    The Austin Bergstrom to Ontario flight path was viewed by 3 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 6h 27m. Frontier provides one of the quickest options available for as low as $134. Austin and Ontario are separated by a distance of 1193 mi.

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

    According to our current data, Frontier ($130), American Airlines ($216), and Delta ($217) offers the cheapest pricing from Austin to Ontario. These flights start at 63% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $67. United Airlines flights start at $108 while deals on Delta start at $109 one-way.

  • What are the cheapest flights from Austin to Ontario?

    The cheapest flight price from Austin to Ontario is $399. On average you can expect to pay $467. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $198.

  • 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, September is the cheapest month in which you can book a flight from Austin to Ontario (average of $60). Flying from Austin to Ontario in March is currently the most expensive (average of $107). 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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Alternative routes for Austin to Ontario

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 December 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$221FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$408FlexibilityNo cancel feeOn-time71%
DeltaCheapest$217Average$306FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$245Average$388FlexibilityNo cancel feeOn-time63%

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