HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$63+ 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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Jun 11 — Jun 181
Thu 6/11
Thu 6/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Austin to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Austin Bergstrom to Ontario are usually found in September or May, booked 56 days in advance, depart on a Monday or Wednesday 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 May 12, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:13 pm
AUS
-
ONT
1 stop28h 36m
Multiple Airlines
Wed 6/173:34 pm
ONT
-
AUS
1 stop17h 20m
Multiple Airlines
Deal found 5/11$155
This Kiwi.com deal was found by Cheapflights users on 5/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:13 pm
AUS
-
ONT
1 stop28h 36m
Frontier
Thu 6/411:51 am
ONT
-
AUS
1 stop7h 56m
Frontier
Deal found 5/12$161
This Kiwi.com deal was found by Cheapflights users on 5/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:13 pm
AUS
-
ONT
1 stop28h 36m
Frontier
Tue 6/163:34 pm
ONT
-
AUS
2 stops30h 25m
Frontier
Deal found 5/11$189
This Kiwi.com deal was found by Cheapflights users on 5/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/319:13 pm
AUS
-
ONT
2 stops19h 56m
Multiple Airlines
Wed 6/34:39 pm
ONT
-
AUS
1 stop16h 15m
Multiple Airlines
Deal found 5/11$203
This Frontier deal was found by Cheapflights users on 5/7. 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 6/98:15 pm
AUS
-
ONT
1 stop5h 34m
Frontier
Wed 6/106:00 am
ONT
-
AUS
1 stop11h 30m
Frontier
Deal found 5/7$210
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Sat 6/62:28 pm
AUS
-
ONT
1 stop11h 21m
Frontier
Tue 6/93:34 pm
ONT
-
AUS
2 stops30h 25m
Frontier
Deal found 5/7$211
This Super.com deal was found by Cheapflights users on 5/8. 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.
Tue 8/48:15 pm
AUS
-
ONT
1 stop5h 35m
Frontier
Mon 8/1010:49 am
ONT
-
AUS
1 stop6h 14m
Frontier
Deal found 5/8$212

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 May 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$149
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$282

Good round-trip deal

$389 or less

Good one-way deal

$243 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. 12% potential increase in price ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
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.
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 May 12, 2026.
Use the filters below to find and compare flights from Austin to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 5/23

6:50 pm-10:45 pm

1 stop5h 55m

Ontario

Sun 5/24

1:29 pm-9:33 pm

1 stop6h 04m

$277

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 5/28

1:31 pm-9:48 pm

1 stop10h 17m

Ontario

Sat 5/30

1:29 pm-9:33 pm

1 stop6h 04m

$277

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 5/23

6:50 pm-10:45 pm

1 stop5h 55m

Ontario

Tue 5/26

10:00 pm-9:33 am

1 stop9h 33m

$277

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 5/28

2:45 pm-10:37 pm

2 stops9h 52m

Ontario

Sat 5/30

5:45 am-1:24 pm

1 stop5h 39m

$347

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 6/5

6:04 pm-9:55 pm

1 stop5h 51m

Ontario

Tue 6/9

1:50 pm-10:27 pm

1 stop6h 37m

$362
Quickest round-trip

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 7/18

7:05 pm-8:00 pm

Nonstop2h 55m

Ontario

Tue 8/18

8:25 am-1:15 pm

Nonstop2h 50m

$367

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 5/29

6:32 pm-11:34 pm

1 stop7h 02m

Ontario

Fri 6/19

9:40 am-6:17 pm

1 stop6h 37m

$373

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sun 7/12

6:15 am-12:20 pm

2 stops8h 05m

Ontario

Fri 7/17

8:35 am-7:45 pm

2 stops9h 10m

$378

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 6/18

5:50 am-10:10 am

1 stop6h 20m

Ontario

Mon 6/22

2:00 pm-6:50 pm

Nonstop2h 50m

$383

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Fri 5/15

6:32 pm-11:34 pm

1 stop7h 02m

Ontario

Sun 5/24

12:07 pm-12:31 am

1 stop10h 24m

$398

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/12

Showing 1-10 of 23 resultsSorted by cheapest first
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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 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.

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?

To ensure you get the cheapest price possible for a flight from Austin to Ontario, you should look to book at least 55 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 $276). Flying from Austin to Ontario in December is currently the most expensive (average of $467). 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 May 12, 2026.

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 9% versus a flight in the morning.

How much does it cost to fly round-trip from Austin to Ontario?

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
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

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

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 May 12, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andAmerican 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
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
7.9
Good
4,296 reviews
Southwest
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,452 reviews
Southwest
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,663 reviews
Southwest
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
JetBlue
7.1
Good
2,972 reviews
Southwest
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.6
Fair
2,952 reviews
Southwest
7.9
Good
4,296 reviews

Crew

8.6

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 55m. Delta provides one of the quickest options available for as low as $277. 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 ($144), Delta ($177), and American Airlines ($186) offers the cheapest pricing from Austin to Ontario. These flights start at 57% 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 $78. Delta flights start at $109 while deals on American Airlines start at $118 one-way.

  • What are the cheapest flights from Austin to Ontario?

    The cheapest flight price from Austin to Ontario is $180. On average you can expect to pay $427. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $214.

  • 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 $276). Flying from Austin to Ontario in December is currently the most expensive (average of $467). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Austin to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
Hobby to Las Vegas flights
Dallas/Fort Worth to San Francisco flights
Hobby to Los Angeles flights
George Bush Intcntl to Las Vegas flights
George Bush Intcntl to Los Angeles flights
Dallas/Fort Worth to San Diego flights
Dallas/Fort Worth to Ontario flights
Austin to Las Vegas flights
Austin to Los Angeles flights
Hobby to Ontario flights
Hobby to San Francisco flights
Love Field to Las Vegas flights
San Antonio to Las Vegas flights
George Bush Intcntl to Ontario flights
Hobby to San Diego flights
George Bush Intcntl to San Francisco flights
Dallas/Fort Worth to Santa Ana flights
George Bush Intcntl to San Diego flights
Love Field to Los Angeles flights
San Antonio to Los Angeles flights
Hobby to Santa Ana flights
Dallas/Fort Worth to San Jose flights
Austin to San Francisco flights
Love Field to San Francisco flights
Austin to San Diego flights
George Bush Intcntl to Santa Ana flights
Dallas/Fort Worth to Reno flights
Dallas/Fort Worth to Sacramento flights
Love Field to San Diego flights
El Paso to Las Vegas flights
Dallas/Fort Worth to Burbank flights
San Antonio to San Francisco flights
Austin to San Jose flights
Dallas/Fort Worth to Oakland flights
Hobby to Long Beach flights
Hobby to Sacramento flights
San Antonio to San Diego flights
Austin to Santa Ana flights
Hobby to San Jose flights
Dallas/Fort Worth to Fresno flights
Dallas/Fort Worth to Long Beach flights
Austin to Oakland flights
El Paso to Los Angeles flights
George Bush Intcntl to San Jose flights
Love Field to Santa Ana flights
San Antonio to Ontario flights
Dallas/Fort Worth to Palm Springs flights

Top 5 airlines flying from Austin to Ontario

Discover the top 5 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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$144Average$222FlexibilityNo cancel feeOn-time62%
DeltaCheapest$177Average$286FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$356FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$232Average$337FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$236Average$389FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.