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$80+ 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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$143
(Gotogate)

One-way from

$80
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$229

Good round-trip deal

$277 or less

Good one-way deal

$178 or less
From Austin Bergstrom to Ontario
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One-way flight from Austin Bergstrom to Ontario
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Highest demand for flights based on searches. 0% potential increase in price ($0 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This Gotogate deal was found by Cheapflights users on 9/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/269:23 pmAUS - ONT
1 stop24h 31mFrontier
mar. 9/308:59 pmONT - AUS
1 stop21h 59mFrontier
Deal found 9/10$143
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/66:00 amAUS - ONT
1 stop7h 10mFrontier
dom. 11/96:53 amONT - AUS
1 stop24h 49mFrontier
Deal found 9/10$144
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/47:50 amAUS - ONT
1 stop14h 04mFrontier
sáb. 10/117:04 amONT - AUS
1 stop15h 29mFrontier
Deal found 9/11$152
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/156:00 amAUS - ONT
1 stop19h 50mFrontier
mié. 10/226:53 amONT - AUS
1 stop15h 40mFrontier
Deal found 9/10$154
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/1710:47 pmAUS - ONT
1 stop27h 03mFrontier
mar. 10/217:04 amONT - AUS
1 stop15h 29mFrontier
Deal found 9/10$158
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/229:23 pmAUS - ONT
1 stop24h 31mFrontier
lun. 9/294:08 pmONT - AUS
1 stop26h 50mFrontier
Deal found 9/11$161
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/216:30 amAUS - ONT
1 stop27h 23mFrontier
vie. 9/268:59 pmONT - AUS
1 stop23h 01mFrontier
Deal found 9/10$162
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/76:00 amAUS - ONT
1 stop19h 50mFrontier
mié. 10/86:53 amONT - AUS
1 stop15h 40mFrontier
Deal found 9/10$165
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/236:00 amAUS - ONT
1 stop5h 35mFrontier
lun. 10/276:53 amONT - AUS
1 stop15h 40mFrontier
Deal found 9/11$168
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/26:30 amAUS - ONT
1 stop27h 23mFrontier
dom. 10/58:59 pmONT - AUS
1 stop24h 33mFrontier
Deal found 9/10$169

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 septiembre 11, 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

vie. 10/17

10:47 pm-11:50 pm

1 stop27h 03m

Ontario

lun. 10/20

6:53 am-12:33 am

1 stop15h 40m

$144

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

jue. 9/25

6:30 am-7:54 pm

1 stop15h 24m

Ontario

jue. 10/2

8:59 pm-11:32 pm

1 stop24h 33m

$173

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

jue. 9/25

6:30 am-7:53 am

1 stop27h 23m

Ontario

mar. 9/30

8:59 pm-8:58 pm

1 stop21h 59m

$174

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

mar. 10/7

6:00 am-11:50 pm

1 stop19h 50m

Ontario

mar. 10/14

7:04 am-12:57 pm

2 stops27h 53m

$221

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

mar. 3/3

1:55 pm-7:47 pm

1 stop7h 52m

Ontario

mié. 3/4

6:00 am-4:38 pm

1 stop8h 38m

$236

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

lun. 11/17

7:00 am-3:17 pm

1 stop10h 17m

Ontario

mié. 11/19

6:00 am-6:18 pm

1 stop10h 18m

$239

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

sáb. 10/18

8:10 am-12:14 pm

1 stop6h 04m

Ontario

lun. 10/20

10:00 pm-9:38 am

1 stop9h 38m

$257

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

vie. 10/17

7:15 pm-11:39 pm

1 stop6h 24m

Ontario

sáb. 10/18

7:05 am-6:30 pm

1 stop9h 25m

$257

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

vie. 10/17

7:15 pm-11:39 pm

1 stop6h 24m

Ontario

lun. 10/20

10:00 pm-9:38 am

1 stop9h 38m

$271

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

sáb. 10/25

5:40 pm-9:10 pm

1 stop5h 30m

Ontario

mar. 10/28

10:10 am-3:00 pm

Nonstop2h 50m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 24 results
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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 29, 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 septiembre 11, 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 septiembre 11, 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

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
4,248 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

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. 3h 00m 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 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 27h 03m. Frontier provides one of the quickest options available for as low as $144. 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 ($108), American Airlines ($197), 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 airlines to fly from Austin to Ontario one-way?

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $118. Alaska Airlines flights start at $118 while deals on Delta start at $119 one-way.

  • 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 $412. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $144.

  • 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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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$218FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$197Average$389FlexibilityNo cancel feeOn-time71%
DeltaCheapest$217Average$326FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$231Average$382FlexibilityNo cancel feeOn-time63%

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