AUS - ONT

$72 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 4/21. 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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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$217
Typical prices: $467-$275
Delta
Wed 5/27Sat 5/30
AUS - ONT • 1 stop
Cheapest non-stop
$371
Typical prices: $469-$247
Southwest
Tue 5/12Tue 6/9
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
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $217 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
You can fly direct with Southwest. Average duration is 3h 07m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $230 (round-trip)
Shortest trip • 5h 06m (one-way)
Insights
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Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 31% compared to booking last minute.
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When to travel
Cheapest • 20% price drop
Most popular
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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

Wed, May 27 - Sat, May 30
Delta Logo
6:32 pm - 11:34 pm
AUS
-
ONT
7h 02m
1 stop
Delta Logo
10:00 pm - 9:33 am
ONT
-
AUS
9h 33m
1 stop
$217Delta
Sun, Apr 12 - Sun, Apr 19
Frontier Logo
10:01 pm - 8:04 am
AUS
-
ONT
12h 03m
1 stop
Frontier Logo
12:59 am - 10:05 am
ONT
-
AUS
7h 06m
1 stop
$218Frontier
Thu, Apr 16 - Sat, Apr 18
Frontier Logo
9:31 pm - 10:49 am
AUS
-
ONT
15h 18m
2 stops
Frontier Logo
12:59 am - 8:56 pm
ONT
-
AUS
17h 57m
1 stop
$219Frontier
Thu, Apr 30 - Sun, May 3
Frontier Logo
9:31 pm - 7:31 am
AUS
-
ONT
12h 00m
1 stop
Frontier Logo
4:29 pm - 8:52 pm
ONT
-
AUS
26h 23m
2 stops
$220Frontier
Sun, Apr 12 - Fri, Apr 17
Frontier Logo
10:01 pm - 8:04 am
AUS
-
ONT
12h 03m
1 stop
Frontier Logo
11:44 am - 7:44 pm
ONT
-
AUS
6h 00m
1 stop
$221Frontier
Mon, May 11 - Sat, May 16
Frontier Logo
9:13 pm - 7:11 pm
AUS
-
ONT
23h 58m
2 stops
Frontier Logo
10:50 am - 8:18 pm
ONT
-
AUS
7h 28m
1 stop
$222Frontier
Sat, Apr 25 - Mon, Apr 27
Frontier Logo
8:50 pm - 7:26 am
AUS
-
ONT
12h 36m
1 stop
Frontier Logo
2:05 pm - 5:18 pm
ONT
-
AUS
25h 13m
2 stops
$223Frontier
Tue, Apr 28 - Thu, May 7
Frontier Logo
6:13 pm - 11:55 pm
AUS
-
ONT
7h 42m
1 stop
Frontier Logo
11:36 am - 9:47 pm
ONT
-
AUS
8h 11m
1 stop
$225Frontier
Sun, May 3 - Thu, May 21
Frontier Logo
9:51 pm - 7:31 am
AUS
-
ONT
11h 40m
1 stop
Frontier Logo
6:00 am - 8:18 pm
ONT
-
AUS
12h 18m
1 stop
$226Frontier
Mon, Apr 20 - Sun, Apr 26
Frontier Logo
9:31 pm - 8:39 pm
AUS
-
ONT
25h 08m
2 stops
Frontier Logo
9:29 pm - 12:15 pm
ONT
-
AUS
12h 46m
1 stop
$227Frontier
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 May.

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 Saturday 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 Saturdays.

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 $278 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $467 and $411 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 31% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 20 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 seasonNovember
Cheapest flight$72
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 3% increase in price.
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 $72 for a one-way ticket and $217 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?

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

  • 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 $383 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 $184 or less one-way and $382 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

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

Ontario to Austin Bergstrom

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

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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 4333 reviews
8.1Boarding
8.0Comfort
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

Boarding was easy. The seats are small and fairly uncomfortable

8.0 ExcellentNicole, Mar 2026
LGB - OAK
Read more Southwest reviews

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.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

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.

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.

The cabin temperature was nice and cool. The wifi was not working.

As previously noted, this flight was great: departure was timely, the crew was friendly and attentive, and wifi connectivity was seamless. In particular, I appreciated that the flight attendant just told me to stow the laptop right before takeoff/landing, and trusted me to do so (which I did!).

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

Absolutely horrible. Flight was delayed 4 hours and they had no clue what was going on.

Onboard functioning wide-variety entertainment on a budget and having an open pantry is nice. Seats are not comfortable but go provide plenty of legroom for a 6'2" 260lbs man.

Even though the weather made a lot of flights become cancelled Jet Blue made the flight that was supposed to leave at 9 pm and we left at 12:15 am and I was so grateful- Thanks to the Senior Jet Blue Staff who made those decisions

Worst customer service ever experienced on the planet, dirty plane, no communication, and severe delays

Flight cancelled 2 hours prior to boarding. No explanation. No refunds.

Delayed by 1.5 hours. Terrible apologies, half hearted at best. It will be a LONG time until i book w Jet Blue again. Very disappointed.

My check in was stressful. I somehow lost my seat from my original booking, the plane showed no availability/no seat when it was time to check-in. I called and was instructed to try to get a seat at the airport. I asked if it was a full flight and the travel agent said the site showed some seating but was not able to secure one for me. Why not? On my way to the airport the app finally revealed one available seat towards the back of the aircraft that I was able to book. It ended up being an overbooked flight, so glad I wasn't stuck.

Flights with JetBlue from San Diego to Boston are a miserable experience. The flight was delayed about 1.5 hours due to “weather” supposedly but the flights for other airlines left on time so it just have been some kind of weather that only affects JetBlue. I had a small carry on - purse. The crew stored it in a bin 2 rows down from me because they were using the bin next to my seat for other people’s stuff. The TV screen in the emergency row seats does not work. It just was awful from start to finish. When we landed, we had to sit inside the plane for a very long time because the plane had to be moved to a different gate.

They made me check my bag and I didn't need to as there was overhead space available. I paid for a seat towards the front of the plane and it didn't recline. I requested a refund and they declined to give me one.

I have to congratulate Kayak (and Dylan the Chatdeal agent) because because when we decided extended our trip in Florida by two days, there were many direct flights oprions back to Boston available on the Friday we wanted to fly on the JetBlue website, but once I canceled the original JetBlue flight on their website, those direct return options disappeared immediatley! I think it's a game JetBlue plays. . Luckily, I checked Kayak and they had a direct flight that wasn't appearing on JetBlue's website and so I booked it, and we were able to fly home direct through the Kayak booking when JetBlue was offering nothing (even though I have been a True Blue member for 20 years, and also am a Mosaic member). So much for loyalty- their algorithm for booking is like a shell game. JetBlue used to be a good company but now they're worse than anyone. Also I was originally booked this trip to Florida, two months before the departure date, I booked the trip on JetBlue's website and then after the payment part, they said there was a problem and that I needed to do the booking again, so when I immediately went to rebook , the price had gone up 30%! I called them and it sounded like they had heard this so many times before and the guy told me to check back in 10 minutes and the price would be back to where it was when I was booking- it but it never was. How could the price go up 30% in one minute two months before the flight???? They're playing a game with their customers. Anyways, I booked a cheaper flight then at a less convenient time. So fast forward two months the night before the 7 AM flight, they sent me an email at midnight when I was sleeping to let me know that my flight at 7 AM had been canceled. The only thing they offered was a flight that night from from a different airport (Providence) to a different airport in Florida (West Palm Beach) or a flight two days later. No compensation, nothing. They couldn't of tried to get another plane to the Boston airport? They had all night to do it. I passed on their ridiculous options and flew with Delta and it was a great experience. Of course, I had to pay a lot more booking on the same day, but JetBlue doesn't care. I put in a lengthy complaint with the agent who assured me someone would get back to me by email within three days and I haven't heard a thing. JetBlue used to be a good company but now they're among the worst. The only thing they still have is decent legroom, but the corporate bean counters will probably start taking that away too.

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.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

The TSA check in took 1.5 hours to get through in Austin and I missed my flights back to DC

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

AA did not allow to board a flight because my connecting flight from DFW had been canceled. I got on another flight to another city. No service on the plane and I did not use their entertainment system.

Amazing I love American. I’ll never fly anyone else if I can help it.

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