HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$108+ 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 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 January or August, booked 76 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 June 12, 2025.

Round-trip from

$175
(Frontier)

One-way from

$108
(FlightHub)

Popular in

December

Cheapest in

January

Average price

$353

Good round-trip deal

$313 or less

Good one-way deal

$153 or less
From Austin Bergstrom to Ontario
Search Deals
One-way flight from Austin Bergstrom to Ontario
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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.
Search Deals

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 June 12, 2025.

This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/111:59 pmAUS - ONT
1 stop8h 53mFrontier
Thu 8/146:00 amONT - AUS
1 stop5h 04mFrontier
Deal found 6/12$175
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2912:33 pmAUS - ONT
1 stop11h 07mAmerican Airlines
Wed 11/51:31 pmONT - AUS
1 stop7h 50mAmerican Airlines
Deal found 6/11$243
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/51:00 pmAUS - ONT
Nonstop3h 00mSouthwest
Tue 8/123:35 pmONT - AUS
1 stop4h 20mSouthwest
Deal found 6/11$247
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/96:00 pmAUS - ONT
1 stop7h 59mAlaska Airlines
Tue 7/152:22 pmONT - AUS
1 stop7h 43mAlaska Airlines
Deal found 6/10$248
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:13 amAUS - ONT
1 stop5h 34mDelta
Wed 7/165:09 pmONT - AUS
1 stop5h 21mDelta
Deal found 6/10$259
This Hawaiian Airlines deal was found by Cheapflights users on 6/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/267:15 amAUS - ONT
1 stop8h 11mHawaiian Airlines
Sat 7/266:51 pmONT - AUS
1 stop9h 16mHawaiian Airlines
Deal found 6/12$318
This United Airlines deal was found by Cheapflights users on 6/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1112:50 pmAUS - ONT
2 stops12h 02mUnited Airlines
Thu 8/141:34 pmONT - AUS
2 stops7h 25mUnited Airlines
Deal found 6/12$347

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 June 12, 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 8/11

1:59 pm-8:52 pm

1 stop8h 53m

Ontario

Thu 8/14

6:00 am-1:04 pm

1 stop5h 04m

$175

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 10/29

12:33 pm-9:40 pm

1 stop11h 07m

Ontario

Wed 11/5

1:31 pm-11:21 pm

1 stop7h 50m

$243

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 8/5

1:00 pm-2:00 pm

Nonstop3h 00m

Ontario

Tue 8/12

3:35 pm-9:55 pm

1 stop4h 20m

$247

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Wed 7/9

6:00 pm-11:59 pm

1 stop7h 59m

Ontario

Thu 7/17

6:58 pm-6:07 am

1 stop9h 09m

$248

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 7/8

5:13 am-8:47 am

1 stop5h 34m

Ontario

Tue 7/15

2:14 pm-11:56 pm

1 stop7h 42m

$259

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Sat 7/26

7:15 am-1:26 pm

1 stop8h 11m

Ontario

Sat 7/26

6:51 pm-6:07 am

1 stop9h 16m

$318

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Mon 8/11

12:50 pm-10:52 pm

2 stops12h 02m

Ontario

Thu 8/14

1:34 pm-10:59 pm

2 stops7h 25m

$347

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 9/16

6:00 am-11:50 pm

1 stop19h 50m

$108

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Tue 9/9

1:00 pm-2:00 pm

Nonstop3h 00m

$119

AustinOntario

AUS - ONT

AUSONT

Austin Bergstrom

Thu 9/11

5:50 pm-11:53 pm

1 stop8h 03m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

Showing 1-10 of 14 results
1
2

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 June 9, 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, 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 June 12, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
To help decide which airline to fly from Austin to Ontario, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 1 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 ($175), American Airlines ($243), and Southwest ($247) offers the cheapest pricing from Austin to Ontario. These flights start at 48% 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 $108. Southwest flights start at $119 while deals on Hawaiian Airlines start at $123 one-way.

  • What are the cheapest flights from Austin to Ontario?

    The cheapest flight price from Austin to Ontario is $125. On average you can expect to pay $290. The most popular route, (Austin Bergstrom - Ontario), can usually be booked for $230.

  • 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

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
George Bush Intcntl to Las Vegas flights
Dallas/Fort Worth to San Francisco flights
Hobby to Los Angeles flights
George Bush Intcntl to Los Angeles flights
Austin to Las Vegas flights
Dallas/Fort Worth to Burbank flights
Dallas/Fort Worth to San Diego flights
Love Field to Las Vegas flights
Dallas/Fort Worth to Santa Ana flights
Hobby to Ontario flights
George Bush Intcntl to Ontario flights
Austin to Los Angeles flights
San Antonio to Las Vegas flights
Austin to San Francisco flights
Hobby to San Francisco flights
Dallas/Fort Worth to San Jose flights
Love Field to Los Angeles flights
Dallas/Fort Worth to Oakland flights
Hobby to San Diego flights
George Bush Intcntl to San Francisco flights
Austin to San Diego flights
Hobby to Santa Ana flights
George Bush Intcntl to San Diego flights
San Antonio to Los Angeles flights
George Bush Intcntl to Santa Ana flights
Dallas/Fort Worth to Ontario flights
Hobby to Burbank flights
George Bush Intcntl to Burbank flights
Austin to San Jose flights
San Antonio to San Francisco flights
Hobby to San Jose flights
Dallas/Fort Worth to Reno flights
Hobby to Sacramento flights
Hobby to Oakland flights
George Bush Intcntl to San Jose flights
Hobby to Reno flights
Dallas/Fort Worth to Long Beach flights
Love Field to San Diego flights
El Paso to Las Vegas flights
Love Field to San Francisco flights
George Bush Intcntl to Sacramento flights
Austin to Santa Ana flights
George Bush Intcntl to Oakland flights
Dallas/Fort Worth to Sacramento flights
Austin to Burbank flights
San Antonio to Ontario 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$214FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$188Average$345FlexibilityNo cancel feeOn-time71%
DeltaCheapest$221Average$369FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$230Average$383FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$295Average$502FlexibilityNo cancel feeOn-time69%

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.