AUS - ONT

$59 Find Cheap Flights from Austin to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Austin to Ontario departing on 8/25. 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 Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Austin to Ontario, 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 Austin to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$123
Typical prices: $431-$258
Frontier
Sat 8/15Wed 8/19
AUS - ONT • 1 stop
Cheapest non-stop
$329
Typical prices: $587-$299
Southwest
Thu 8/13Mon 8/17
AUS - ONT • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
AUS features live music on 8 stages for travelers.
Use Omnitrans Bus Route 61 for budget-friendly transit.
Expert advice
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Nonstop flights
You can fly direct with Southwest. Average duration is 3h 00m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $237 (round-trip)
Shortest trip • 5h 02m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 33% compared to booking last minute.
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When to travel
Cheapest • 19% price drop
Most popular
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We hope you love your trip to Ontario!
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Flight Deals

Cheap Flights from Austin to Ontario (AUS-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Austin to Ontario 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 Austin to Ontario

Sat, Aug 15 - Wed, Aug 19
Frontier Logo
6:30 am - 11:50 pm
AUS
-
ONT
19h 20m
1 stop
Frontier Logo
6:00 am - 7:30 pm
ONT
-
AUS
11h 30m
1 stop
$123Frontier
Tue, Jul 21 - Wed, Jul 22
Frontier Logo
8:15 pm - 10:03 am
AUS
-
ONT
15h 48m
1 stop
Frontier Logo
3:40 pm - 11:23 am
ONT
-
AUS
17h 43m
1 stop
$149Frontier
Tue, Jun 2 - Wed, Jun 17
Multiple Airlines Logo
9:13 pm - 11:49 pm
AUS
-
ONT
28h 36m
1 stop
Multiple Airlines Logo
3:34 pm - 10:54 am
ONT
-
AUS
17h 20m
1 stop
$155Multiple Airlines
Tue, Jun 2 - Wed, Jun 17
Multiple Airlines Logo
9:13 pm - 10:05 am
AUS
-
ONT
14h 52m
1 stop
Multiple Airlines Logo
1:33 pm - 10:54 am
ONT
-
AUS
19h 21m
1 stop
$157Multiple Airlines
Tue, Jun 2 - Thu, Jun 4
Frontier Logo
9:13 pm - 11:49 pm
AUS
-
ONT
28h 36m
1 stop
Frontier Logo
11:51 am - 9:47 pm
ONT
-
AUS
7h 56m
1 stop
$161Frontier
Wed, Sep 9 - Sat, Sep 12
Frontier Logo
6:45 am - 1:57 pm
AUS
-
ONT
9h 12m
1 stop
Frontier Logo
6:00 am - 7:21 pm
ONT
-
AUS
11h 21m
1 stop
$163Frontier
Wed, Jun 3 - Wed, Jun 10
Frontier Logo
10:52 pm - 7:32 pm
AUS
-
ONT
22h 40m
1 stop
Frontier Logo
1:33 pm - 11:17 am
ONT
-
AUS
19h 44m
1 stop
$167Frontier
Sat, Aug 15 - Wed, Aug 19
Frontier Logo
6:30 am - 11:50 pm
AUS
-
ONT
19h 20m
1 stop
Frontier Logo
3:34 pm - 9:13 am
ONT
-
AUS
15h 39m
2 stops
$171Frontier
Wed, Jun 3 - Tue, Jul 28
Frontier Logo
10:52 pm - 3:09 pm
AUS
-
ONT
18h 17m
1 stop
Frontier Logo
6:00 am - 12:07 am
ONT
-
AUS
16h 07m
1 stop
$180Frontier
Wed, Jun 3 - Tue, Jul 28
Frontier Logo
10:52 pm - 3:09 pm
AUS
-
ONT
18h 17m
1 stop
Frontier Logo
3:40 pm - 12:07 am
ONT
-
AUS
30h 27m
2 stops
$184Frontier
Booking Insights

KAYAK's insights & trends for Austin to Ontario flights

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

How much is a round-trip flight from Austin to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Austin to Ontario departing in August.

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Austin to Ontario, 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 Austin to Ontario is September, where tickets cost $276 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $465 and $397 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Austin to Ontario, 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 Austin to Ontario, you should book around 4 weeks before departure, which saves you about 33% 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 Austin to Ontario

 
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.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

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.

Harriet Baskas

Harriet Baskas

Expert on AUS

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.

Good to know

Low seasonAugust
Cheapest flight$59
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Austin to Ontario

When to book flights from Austin to Ontario

Are your dates flexible? Find out the best times to travel from Austin to Ontario 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 Austin to Ontario

  • What is the cheapest flight from Austin to Ontario?

    In the last 3 days, the lowest price for a flight from Austin to Ontario was $59 for a one-way ticket and $123 for a round-trip.

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

    No, a passport isn't needed to fly from Austin to Ontario. However, local authorities might ask for an official ID.

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

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

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

    The Boeing 737-800 is the aircraft model that flies most regularly on the Austin to Ontario flight route.

  • Which airline alliances offer flights from Austin to Ontario?

    SkyTeam, and oneworld are the airline alliances operating flights between Austin and Ontario, with SkyTeam being the most commonly used for this route.

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

    There are nonstop flights from Austin to Ontario on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Austin to Ontario are Southwest and Delta. With an average price for the route of $389 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 $286 and an overall rating of 7.9.

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

    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 Austin to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Austin 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 Austin to Ontario?

    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 Ontario with an airline and back to Austin with another airline. Booking your flights between Austin and ONT 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 Austin to Ontario?

    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 Ontario from Austin 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 Austin to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $243 or less one-way and $389 or less round-trip.

Prefer to fly direct from Austin to Ontario?

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

Direct departures

Austin Bergstrom to Ontario

Monday

Southwest

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Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

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Southwest

See more direct flights

Direct returns

Ontario to Austin Bergstrom

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

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Sunday

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See more direct flights

Reviews of the top 5 airlines serving from Austin to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Austin to Ontario. 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 Austin to Ontario? 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 4296 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
7.0Food
8.6Crew
Airline reviews

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

10.0 ExcellentRobert, May 2026
LAS - SFO
Read more Southwest reviews

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The new seat assignment thing is wierd. If you don’t pay for a seat they always assign you a middle seat regardless of how many people are on the flight. Idk… the new company that bought Southwest is trying to make it more profitable, but I’m just not seeing it. The flight attendants aren’t having as much fun anymore. It just feels like the airline is slowly dying. IMO. We shall see if Southwest is the next Toy’s R Us.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

The crew bent over backwards to thank us for flying and make us comfortable. The food service was quick and efficient. The Captain communicated and said goodbye and thank you as we departed. They really stood out!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

my mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

Staff at the check-in counter were friendly, happy and helpful. They tagged our bags and sent us to “bag drop off” but were not very clear about where that was. The airport was busy we headed off in what we thought was the right direction until a gentleman waved us down and actually came after us. He was the baggage handler for Delta and recognized our “deer in the headlights “ look-he brought us to the right area (which was marked as the Southwest Airlines Drop Off) and sent us on our way. Wonderful guy, low key and working with a big smile on his face. Loved it. Loved him.

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

I haven’t flown economy in over 20 years but it was not bad. Room by my feet for my bag and seat was roomy enough. Surprised in a good way.

All airline travel outside of First or Business class is an ordeal to be endured. This trip was ok, small o, small k.

TV was broken and could not shut it off. The flicking was bother me and gave me a headache. The WiFi wouldn’t work correctly, I was able to text but not search the web or surf social media. The plane itself had a lot of wear and tear it is due for an update.

JetBlue not only has the most comfortable planes, but also used to have the best customer service. Lorie Wright, the lady at the gate was very rude not only to me, but to other passengers as well. Her colleague, the gentleman was also not very friendly. They both were acting like they were doing passengers a favor. The crew on board was very nice.

Flight was on time and smooth. Customer service was decent

The space between seat rows seemed to be larger than other airlines. I didn’t check their food or entertainment since I slept most of the way. They do seem to have a lot of options for purchase though.

Kayak sucked. You gave me a confirmation number that was not useable by the jet blue system. Nor did you send any check in emails. I’ll not be using your site again. Nice work.

Given us a free miles or free flight for waiting for 9 hours I didn’t get home till 5am in the morning and I was supposed to be home at 9:30 touch down.

Excellent price. Everything on time. two bad parts. Kayak said I couldn't sign in for the flight online, but I got an email at the same time from Jet Blue and they let me sign in online. Second bad part was that, although I had provided my known traveler number, neither of my boarding passes, for this flight and the previous one, had TSA pre-check showing.

Jet blue was great But the Jayak system Wasa pure nightmare and wasted so much of my time and energy by not giving me a way to access jet blue to check in the flight back I didn’t even get the number confirmation code 24 hours before. Because I didn’t receive the email with the confirmation code I could NoT CHECk IN. I spoke to a kayak third party and they informed me I could not carry a carry on, on the flight which caused me so much extra stress it was just too much. You can be sure I will not be using it recommending your site. Again.

There was a screen but no earphones that could use the older input so I could listen to anything.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Flight: Started on time. Comfortable flight. Arrived on time. Crew: Very cordial and helpful. Drinks and snack was served with a smile. Overall enjoyed the trip. Regards, Hari Doss Chanchala Doss

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

Wifi was spotty. Tray table was very dirty when I sat down.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Delayed for mechanical and no updates on what was happening and how long the delay might be.

A first class seat should fit a fat person, and this doesn't. The trays in the armrest are less functional than an ordinary tray in the back of the seat.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

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

Information on your arrival and departure airports