ONT - AUS

$62 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 2/3. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$128
Overall average: $303
Frontier
Thu 1/22Mon 1/26
ONT - AUS • 1 stop
Cheapest non-stop
$389
Typical prices: $352-$457
Southwest
Tue 1/27Tue 2/3
ONT - AUS • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
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
Video guide: How to find cheap flights to Austin
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Top airlines
Frontier
Cheapest • from $165 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 30% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 21% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Austin!
Flight Deals
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Expert advice
Flight Deals

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, Jan 22 - Mon, Jan 26
Frontier Logo
8:48 pm - 11:43 am
ONT
-
AUS
12h 55m1 stop
Frontier Logo
3:33 pm - 1:37 pm
AUS
-
ONT
24h 04m1 stop
$128Frontier
Tue, Jan 27 - Tue, Feb 3
Frontier Logo
7:15 am - 10:40 pm
ONT
-
AUS
13h 25m1 stop
Frontier Logo
10:40 am - 3:07 pm
AUS
-
ONT
6h 27m1 stop
$129Frontier
Sat, Jan 31 - Tue, Feb 3
Frontier Logo
7:15 am - 11:11 pm
ONT
-
AUS
13h 56m1 stop
Frontier Logo
10:40 am - 3:07 pm
AUS
-
ONT
6h 27m1 stop
$131Frontier
Thu, Jan 22 - Mon, Jan 26
Frontier Logo
8:48 pm - 11:43 am
ONT
-
AUS
12h 55m1 stop
Frontier Logo
3:33 pm - 1:37 pm
AUS
-
ONT
24h 04m1 stop
$132Frontier
Wed, Jan 21 - Tue, Jan 27
Frontier Logo
3:07 pm - 1:46 pm
ONT
-
AUS
20h 39m1 stop
Frontier Logo
10:40 am - 3:07 pm
AUS
-
ONT
6h 27m1 stop
$133Frontier
Thu, Jan 22 - Sun, Jan 25
Frontier Logo
8:48 pm - 11:43 am
ONT
-
AUS
12h 55m1 stop
Frontier Logo
9:39 pm - 12:10 pm
AUS
-
ONT
16h 31m1 stop
$134Frontier
Fri, Feb 27 - Mon, Mar 2
Frontier Logo
9:43 pm - 3:02 pm
ONT
-
AUS
15h 19m1 stop
Frontier Logo
4:45 pm - 1:11 pm
AUS
-
ONT
22h 26m1 stop
$139Frontier
Sat, Jan 24 - Wed, Jan 28
Frontier Logo
7:15 am - 11:11 pm
ONT
-
AUS
13h 56m1 stop
Frontier Logo
10:40 am - 3:07 pm
AUS
-
ONT
6h 27m1 stop
$144Frontier
Sat, Jan 31 - Wed, Feb 4
Frontier Logo
7:15 am - 11:11 pm
ONT
-
AUS
13h 56m1 stop
Frontier Logo
10:40 am - 3:07 pm
AUS
-
ONT
6h 27m1 stop
$145Frontier
Tue, Jan 20 - Sat, Jan 24
Frontier Logo
7:15 am - 10:40 pm
ONT
-
AUS
13h 25m1 stop
Frontier Logo
10:40 am - 11:24 pm
AUS
-
ONT
14h 44m1 stop
$146Frontier
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 Saturdays and the most expensive ones on Sundays.

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 $258 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $453 and $347 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 30% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to Austin

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

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.

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

Good to know

Low seasonNovember
Cheapest flight$62
Most popular time to fly with an average 5% 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 $62 for a one-way ticket and $128 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?

    Alaska Airlines, Delta, Hawaiian Airlines, American Airlines, and JetBlue 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 MAX 8 is the aircraft model that flies most regularly on the Ontario to Austin flight route.

  • Which airline alliances offer flights from Ontario to Austin?

    SkyTeam, and oneworld are the airline alliances operating flights between Ontario and Austin, with SkyTeam being the most commonly used for this 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 $362 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 $303 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 $173 or less one-way and $467 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 4252 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

8.0 ExcellentRussell, Dec 2025
SAN - OAK
Read more Southwest reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Everything a cheap airline should be at normal airline rates.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Lounge in Lagos is terrible, food on board from Lagos to Atlanta was horrible. Only bright spot the cabin crew were awesome.

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.

WiFi didn’t work the entire flight. Very disappointing. Minimal food and options - sadly the state of current affairs. All other aspects of the flight were fine.

For whatever reason, the flight was not catered -we were told it would be a 45 minute delay waiting for catering - so no food. There were opened candy and peanuts in the seatback pocket. Flight landed early in DFW but due to the assigned gate not being available, we sat on the ground for 30 minutes waiting for the gate to open - making the flight actually arrive at the gate late.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

A little late at the start but all worked out well.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

After arriving in Dallas, the aircraft taxied for an unusually long time and was unable to park at the gate, which caused a significant delay and made me miss my connecting flight. I then had to wait in a very long line to be rebooked, and I was told that no hotel or meal accommodations would be provided. What is even more unacceptable is that my luggage was mishandled and has still not been located. My suitcase contains important medications that I urgently need, and I have been unable to access them due to the airline’s mishandling. This situation has caused me considerable stress and inconvenience, and I need this issue to be resolved immediately.

I appreciated that it was on time, safe and professional. I didn’t like that I wasn’t in a place where I had a window at my window seat. It would have been nice to know that in advance. If it was mentioned in the ticketing, I didn’t notice it.

I have a gluten allergy so didn't have any food

Baggage handling poor. Second time this has happened. My bag went to San Francisco instead of Fiji. No apology. Luckily Nadi airport staff are fantastic. My bag arrived in Fiji the next day.

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

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….

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

Other airlines flying from Ontario to Austin

Flights from the other most popular airlines that fly from Ontario to Austin according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.