AUS - ONT

$63 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 5/11. 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.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Austin to Ontario.
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$217
Typical prices: $402-$276
Frontier
Fri 5/1Tue 5/12
AUS - ONT • 1 stop
Cheapest non-stop
$357
Typical prices: $422-$273
Southwest
Tue 5/12Tue 5/19
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
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Southwest. Average duration is 3h 07m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $230 (round-trip)
Shortest trip • 5h 02m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 19% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Expert advice
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

Fri, May 1 - Tue, May 12
Frontier Logo
9:47 pm - 11:55 pm
AUS
-
ONT
28h 08m
1 stop
Frontier Logo
10:50 am - 1:08 pm
ONT
-
AUS
24h 18m
2 stops
$217Frontier
Thu, May 28 - Fri, Jun 5
Frontier Logo
10:59 pm - 8:04 am
AUS
-
ONT
11h 05m
1 stop
Frontier Logo
8:06 pm - 8:18 pm
ONT
-
AUS
22h 12m
2 stops
$220Frontier
Thu, May 28 - Mon, Jun 1
Frontier Logo
10:59 pm - 8:04 am
AUS
-
ONT
11h 05m
1 stop
Frontier Logo
11:51 am - 9:47 pm
ONT
-
AUS
7h 56m
1 stop
$221Frontier
Fri, May 29 - Sun, May 31
Frontier Logo
10:52 pm - 3:09 pm
AUS
-
ONT
18h 17m
1 stop
Frontier Logo
10:50 am - 9:43 am
ONT
-
AUS
20h 53m
1 stop
$222Frontier
Wed, Apr 29 - Sat, May 2
Frontier Logo
6:13 pm - 7:31 am
AUS
-
ONT
15h 18m
1 stop
Frontier Logo
12:59 am - 8:56 pm
ONT
-
AUS
17h 57m
1 stop
$223Frontier
Sat, May 23 - Thu, May 28
Frontier Logo
2:28 pm - 11:49 pm
AUS
-
ONT
11h 21m
1 stop
Frontier Logo
6:00 am - 8:18 pm
ONT
-
AUS
12h 18m
1 stop
$225Frontier
Sun, May 17 - Fri, May 22
Frontier Logo
10:42 pm - 7:49 am
AUS
-
ONT
11h 07m
1 stop
Frontier Logo
6:00 am - 8:18 pm
ONT
-
AUS
12h 18m
1 stop
$226Frontier
Sun, Jun 7 - Sun, Jun 14
Frontier Logo
9:13 pm - 11:49 pm
AUS
-
ONT
28h 36m
1 stop
Frontier Logo
6:00 am - 11:59 pm
ONT
-
AUS
15h 59m
1 stop
$227Frontier
Sat, Jun 20 - Tue, Jun 23
Frontier Logo
2:15 pm - 7:51 pm
AUS
-
ONT
7h 36m
1 stop
Frontier Logo
3:34 pm - 11:59 pm
ONT
-
AUS
30h 25m
2 stops
$229Frontier
Wed, Jun 10 - Fri, Jun 12
Frontier Logo
6:30 am - 10:05 am
AUS
-
ONT
5h 35m
1 stop
Frontier Logo
6:00 am - 7:30 pm
ONT
-
AUS
11h 30m
1 stop
$230Frontier
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 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 $467 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 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 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$63
Best time to beat the crowds but there is an average 17% increase 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 $63 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 MAX 8 is the aircraft model that flies most regularly on the Austin to Ontario flight route.

  • Which airline alliances offer flights from Austin to Ontario?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Austin and Ontario, with Star Alliance 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 $376 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 $168 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

Southwest

Sunday

Southwest

Southwest

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 4330 reviews
8.6Crew
7.5Entertainment
7.0Food
8.0Comfort
8.1Boarding
Airline reviews

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.

6.0 GoodKenley, Apr 2026
AUS - LAS
Read more Southwest reviews

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.

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.

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.

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

Entertainment and wifi were very sub-par - audio issues and no wifi

We were delayed and had to circle due to weather and had to divert for fuel. While I understand that you can’t control the weather I would have appreciated knowing that the crew wasn’t going to run out of hours and then having to spend the night in the Raleigh airport.

Messy plane that was falling apart Small screens that didn't work

I was traveling with two small kids and our TV s were the only ones not working. Informed the flight attendant who did nothing about them.

They forced me to check my hand luggage at the gate.

I specifically choose not to check bags to ensure I can proceed directly to ground transportation upon arrival. However, due to a recurring lack of cabin space, I was again forced to gate-check my rolling luggage after going through my luggage to take out electronics and batteries. This practice unilaterally changes the service agreement made at the time of purchase. JetBlue needs to find a better way to manage overhead space that honors the carry-on baggage allowance.

Still hasn’t left. Why are you asking how it was?

Flight was good wish there were more snacks options for such a long flight but stewardesses were very pleasant as was flight crew.

I was denied a plastic fork to eat my food and was told plastic forks are for paying customers who buy Jet Blue’s food. So I had to make a utensil out of a cup so nourish my body. Like a refugee. Because decency is dead.

I was especially impressed without efficiently the crew got passengers on and off. One of the stewards was slightly gruff, I thought. No big deal but that's what I noticed.

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.

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

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