ONT - AUS

$80 Find Cheap Flights from Ontario to Austin

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Austin departing on 10/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Austin

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Austin, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Austin, as well as popular online travel agencies
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Cheap Flights from Ontario to Austin (ONT-AUS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Austin that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Austin

Thu, Oct 23 - Tue, Oct 28
American Airlines Logo
1:00 pm - 7:56 pmONT-AUS
4h 56m1 stop
American Airlines Logo
2:18 pm - 6:52 pmAUS-ONT
6h 34m1 stop
$215American Airlines
Find Deal
Wed, Dec 31 - Wed, Jan 7
American Airlines Logo
9:53 am - 4:46 pmONT-AUS
4h 53m1 stop
American Airlines Logo
2:40 pm - 5:53 pmAUS-ONT
5h 13m1 stop
$217American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
Frontier Logo
6:53 am - 3:53 pmONT-AUS
7h 00m1 stop
Frontier Logo
6:00 am - 9:35 amAUS-ONT
5h 35m1 stop
$218Frontier
Find Deal
Fri, Oct 10 - Mon, Oct 13
Frontier Logo
11:53 am - 12:33 amONT-AUS
10h 40m1 stop
Frontier Logo
6:57 pm - 8:42 pmAUS-ONT
27h 45m1 stop
$219Frontier
Find Deal
Tue, Nov 18 - Wed, Nov 19
Delta Logo
6:00 am - 1:04 pmONT-AUS
5h 04m1 stop
Delta Logo
7:23 pm - 11:52 pmAUS-ONT
6h 29m1 stop
$237Delta
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Fri, Oct 24 - Mon, Oct 27
Delta Logo
11:48 am - 11:57 pmONT-AUS
10h 09m1 stop
Delta Logo
5:15 am - 9:05 amAUS-ONT
5h 50m1 stop
$254Delta
Find Deal
Wed, Nov 19 - Sat, Nov 22
Southwest Logo
8:30 am - 6:10 pmONT-AUS
7h 40m2 stops
Southwest Logo
4:10 pm - 8:10 pmAUS-ONT
6h 00m1 stop
$259Southwest
Find Deal
Tue, Nov 18 - Sat, Nov 22
Alaska Airlines Logo
7:20 am - 4:46 pmONT-AUS
7h 26m1 stop
Alaska Airlines Logo
6:15 pm - 11:55 pmAUS-ONT
7h 40m1 stop
$266Alaska Airlines
Find Deal
Thu, Nov 20 - Mon, Nov 24
Alaska Airlines Logo
11:59 am - 12:14 amONT-AUS
10h 15m1 stop
Alaska Airlines Logo
7:40 am - 3:54 pmAUS-ONT
10h 14m1 stop
$276Alaska Airlines
Find Deal
Wed, Oct 8 - Tue, Oct 14
Southwest Logo
12:55 pm - 11:35 pmONT-AUS
8h 40m2 stops
Southwest Logo
5:15 pm - 10:05 pmAUS-ONT
6h 50m2 stops
$277Southwest
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
ONT offers streamlined security with short wait times.
CapMetro’s Bus Route 20 is the cheapest way to downtown.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
American Airlines
Cheapest • from $215 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Video guide: How to find cheap flights to Austin
Watch video
Watch video
Watch video
Watch video
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 19% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$215
Overall average: $328
American Airlines
Thu 10/23Tue 10/28
ONT - AUS • 1 stop
Cheapest non-stop
$317
Typical prices: $256-440
Southwest
Wed 10/15Wed 10/22
ONT - AUS • Non-stop
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We hope you love your trip to Austin!
Expert advice

Expert advice for your flight from Ontario to Austin

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-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.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
ONT

ONT offers streamlined security with average wait times of 6-15 minutes, making it ideal for business travelers seeking efficiency.

Read more about ONTby Jennifer Simonson
AUS

CapMetro’s Bus Route 20 is the cheapest way to travel from AUS to downtown Austin, running every 15 minutes and taking about 35 minutes.

Read more about AUSby Harriet Baskas
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more
Harriet Baskas

Harriet Baskas

Expert on AUS

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Booking Insights

KAYAK's insights & trends for Ontario to Austin flights

Get data-powered insights and trends into flights from Ontario to Austin to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Austin
Find cheap flights to Austin

Planning a trip from Ontario to Austin? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from Ontario to Austin?

The average price of all round-trip flights from Ontario to Austin clicked on KAYAK for each day over the last 12 months.

When flying from Ontario to Austin, you should consider leaving on a Wednesday and avoid Saturdays if you are looking for the best rates. For your return to Ontario, you’ll find the best rates on Tuesdays and the most expensive ones on Mondays.

What is the cheapest month to fly from Ontario to Austin?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Austin, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Austin is April, where tickets cost $259 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $390 and $351 respectively.

How far in advance should I book a flight from Ontario to Austin?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Austin, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Austin, you should book around 4 weeks before departure, which saves you about 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$80
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 2% increase in price.
Flight from Ontario to Austin

When to book flights from Ontario to Austin

Are your dates flexible? Find out the best times to travel from Ontario to Austin based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Austin

  • Is there a lounge at ONT?

    If you have a significant wait for your flight from Ontario to Austin, you may want to head over to the Aspire Lounge. For about $37 per adult, you can enjoy food and beverage services as well as have access to charging stations and free Wi-Fi. The lounge in Terminal 4 is open from around 5 am to about 6 am daily, and the one in Terminal 2 is open from about 5 am, and closing times depend on the day of the week.

  • How do I get to downtown Austin from the airport?

    Your public transport options from AUS to downtown include MetroBus 20, which you can catch from just outside the lower level of the Barbara Jordan terminal for about $2.50. There is a taxi stand outside the car rental center with fares starting around $13.80, and you can also hail a ride from services like Lyft.

  • Where can I ask for information at the airport in Austin?

    If you need assistance at the airport or need to find out about your transportation options to Austin, there are information desks located by the baggage claim area near Doors B4 and B5.

  • Does Austin International offer increased accessibility facilities and services?

    Passengers who need additional assistance will find accessible facilities conveniently located across Austin International airport, including parking, restrooms, and elevators. There are videophones available, as well as raised lettering and braille signs. Walkways also have contrasting surfaces for visually impaired travelers, and there are pet relief areas for service animals.

  • What is the cheapest flight from Ontario to Austin?

    In the last 3 days, the lowest price for a flight from Ontario to Austin was $80 for a one-way ticket and $215 for a round-trip.

  • Do I need a passport to fly between Ontario and Austin?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from Ontario to Austin?

    Delta, Alaska Airlines, Hawaiian Airlines, and American Airlines offer inflight Wi-Fi service on the Ontario to Austin flight route.

  • Which aircraft models fly most regularly from Ontario to Austin?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Ontario to Austin flight route.

  • On which days can I fly direct from Ontario to Austin?

    You can catch a nonstop flight from Ontario to Austin on on Monday, Tuesday, Wednesday, Thursday, Friday, and Sunday.

  • Which is the best airline for flights from Ontario to Austin, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Austin are Southwest and Delta. With an average price for the route of $350 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $316 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Ontario to Austin?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Austin.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Austin?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Austin from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Austin?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Austin with an airline and back to Ontario with another airline. Booking your flights between Ontario and AUS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Austin?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Austin from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to Austin

  • Looking for a cheap flight? 25% of our users found flights on this route for $140 or less one-way and $301 or less round-trip.
  • Ontario International Airport (ONT) serves the Ontario and San Bernadino regions and is about 2 miles from downtown Ontario. Austin–Bergstrom International Airport (AUS) serves the Greater Austin area and is about 5 miles from the city center. Austin International is a focus city for Allegiant Air.
  • While there are non-stop options from Orlando to Austin, you may get a better deal or match your schedule with routes that have one or more stops. This could be Delta stopping in Salt Lake City or United stopping in Denver and Houston.
  • Public transport to ONT includes the Route 61 bus from downtown Ontario to Terminal Way 2 or 4, just a short walk to the entrance. Expect a fare of about $2 a person. Service runs from around 4 am to about 9:30 pm during weekdays and on a shorter schedule on weekends. Or you could grab a cab or use a ride-sharing app like Lyft.
  • If you would rather drive and park your car at Ontario International, there are two daily parking lots. Lot 3 is within walking distance to either Terminal 2 or 4 and costs about $16 a day. Lot 5 is a little further away on John Bangs Drive for $13 a day, and there is a shuttle service to the terminals.
  • Most airlines servicing the flights from Ontario to Austin provide onboard entertainment of some type. You can check each flight's details on KAYAK to see what is available. For example, American Airlines offers free streaming services for your mobile device on flights with onboard Wi-Fi.

Prefer to fly direct from Ontario to Austin?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Ontario to Austin Bergstrom.
Find which airlines fly direct from Ontario Airport to Austin Bergstrom Airport, which days they fly and book direct flights.

Direct departures

Ontario to Austin Bergstrom

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Austin Bergstrom to Ontario

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 4 airlines serving from Ontario to Austin

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Austin. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Austin? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4242 reviews
8.0Comfort
8.6Crew
7.5Entertainment
8.1Boarding
7.0Food
Airline reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

10.0 ExcellentRobert, Sep 2025SFO - LAS
Read more Southwest reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

The flight was scheduled for 2:30 PM. Early in the morning we got a text message saying the flight was delayed and rescheduled for 3:00 PM. We got to the airport with that in mind. Then we got a message during check-in at the flight was rescheduled again for 2:30 PM. We almost missed our flight. In fact, our bags Were told that they would not make it. At the end, everything worked out. But it is very stressful.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

American almost always Delays flights from Austin to Dallas and back. I cannot believe they have such poor service on this route. I was about to switch to American from Delta, but they gave me enough reasons not to.

There's nothing I liked about it. For first off I scheduled this trip two weeks in advance then they delayed my flight which messed up my whole trip. So I scheduled it for the following weekend thinking there won't be a delay and guess what as soon as I got to the airport we said in the airplane on the tarmac for an hour and a half. Not only was it delayed I missed my connecting flight meaning I had to stay the night at Dallas-Fort Worth airport sleeping on the floor. I will tell you this I will never fly American airlines ever again I have had nothing but horrible experience with them and I just throw money at them

Having to reschedule flights a day later, they loaded by luggage on the wrong plane from Little rock now I have to HOPE they deliver it to where im staying like they said would. International flight crew was very disgruntled and not very friendly.

The entertainment package was vast and the selections were very current. Keep updating it was great.

Great flight. No issues at all. I still think boarding could be more efficient but otherwise, a good experience.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

The AA app really sucks ... Every flight & connecting flights were delayed over 30 mins. One connecting flight on American Eagle said it was delayed in its arrival ... when it was actually parked across from the gate for over 1 hr before they pulled it to the gate. Seats in the economy/ main cabin are packed together like sardines ... no leg room.

baggage clamed had to wait over a hour and half for all people on my flight it was terrible

My flight was canceled I was promised a reginf still not received.

The confirmation # CK8GNW and my name was not recognized/in Frontier system. I was able to check in on Frintier app so i went to the Frontier ticket agent, at time they told me that my name/ confirmation did not show up as a purchased ticket. I had to purchase a new ticket that cost $289.00 one way.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Worst airline experience. They were rude and kept changing our seats and/or giving our seats away so our family didn’t get to sit with each other. Almost everyone we dealt with at both airports with this airline was rude. The app kept giving us wrong information making things take longer. Dealing with them before TSA can take close to an hour…longer than I’ve ever had to deal with before. Never using this airline again.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

Everything you need to know for your flight from Ontario to Austin

Information on your arrival and departure airports

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