$60+ Cheap flights from Austin to Ontario (AUS - ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
AUS — ONT
Mar 29 — Apr 51
1 adult, Economy
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Find cheap flights from Austin to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Austin Bergstrom to Ontario are usually found in August or September, booked 56 days in advance, depart on a Tuesday or Saturday and return on a Wednesday
Cheap flight deals from Austin to Ontario
Cheapest
Best
Last-minute
One-way
Cheapest flights from Austin to OntarioExplore the most affordable flight options available from Austin to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 27, 2026.
Explore the most affordable flight options available from Austin to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:13 pm
AUS
- ONT
1 stop7h 42m
Frontier
Mon 4/2012:59 am
ONT
- AUS
1 stop14h 19m
Frontier
Deal found 2/26![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:31 pm
AUS
- ONT
1 stop12h 00m
Frontier
Mon 4/2012:59 am
ONT
- AUS
1 stop14h 19m
Frontier
Deal found 2/24![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/911:00 am
AUS
- ONT
1 stop14h 56m
Frontier
Mon 4/1312:59 am
ONT
- AUS
1 stop14h 19m
Frontier
Deal found 2/27![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:01 am
AUS
- ONT
1 stop14h 54m
Frontier
Sun 4/1912:59 am
ONT
- AUS
1 stop7h 06m
Frontier
Deal found 2/25![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2410:45 pm
AUS
- ONT
1 stop27h 14m
Frontier
Thu 4/210:50 am
ONT
- AUS
1 stop8h 16m
Frontier
Deal found 2/23![Frontier logo]()
$179
This Frontier deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:13 pm
AUS
- ONT
1 stop7h 42m
Frontier
Sat 4/1812:59 am
ONT
- AUS
1 stop7h 06m
Frontier
Deal found 2/24![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1210:01 pm
AUS
- ONT
1 stop12h 03m
Frontier
Sun 4/1912:59 am
ONT
- AUS
1 stop7h 06m
Frontier
Deal found 2/25![Frontier logo]()
$181
Best flights from Austin to OntarioDiscover carefully curated flight deals from Austin to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 27, 2026.
Discover carefully curated flight deals from Austin to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 27, 2026.
This Southwest deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:45 pm
AUS
- ONT
1 stop7h 50m
Southwest
Wed 5/202:25 pm
ONT
- AUS
1 stop5h 40m
Southwest
Deal found 2/23![Southwest logo]()
$216
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:32 pm
AUS
- ONT
1 stop7h 02m
Delta
Thu 6/119:55 am
ONT
- AUS
1 stop5h 37m
Delta
Deal found 2/23![Delta logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/107:15 am
AUS
- ONT
1 stop9h 53m
Alaska Airlines
Wed 3/256:00 am
ONT
- AUS
1 stop16h 34m
Alaska Airlines
Deal found 2/23![Alaska Airlines logo]()
$297
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:00 am
AUS
- ONT
2 stops12h 47m
United Airlines
Sat 5/21:30 pm
ONT
- AUS
1 stop7h 27m
United Airlines
Deal found 2/25![United Airlines logo]()
$298
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:32 pm
AUS
- ONT
1 stop7h 02m
Delta
Fri 6/121:00 pm
ONT
- AUS
1 stop6h 14m
Delta
Deal found 2/23![Delta logo]()
$217
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:00 am
AUS
- ONT
2 stops12h 47m
United Airlines
Sat 4/256:05 am
ONT
- AUS
1 stop4h 59m
United Airlines
Deal found 2/27![United Airlines logo]()
$303
This Delta deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:25 pm
AUS
- ONT
1 stop6h 19m
Delta
Mon 7/279:55 am
ONT
- AUS
1 stop5h 37m
Delta
Deal found 2/25![Delta logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/245:41 pm
AUS
- ONT
1 stop8h 13m
Alaska Airlines
Wed 7/12:09 pm
ONT
- AUS
1 stop8h 25m
Alaska Airlines
Deal found 2/23![Alaska Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/215:30 am
AUS
- ONT
2 stops7h 25m
Southwest
Sun 5/249:15 am
ONT
- AUS
1 stop6h 30m
Southwest
Deal found 2/23![Southwest logo]()
$323
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:32 pm
AUS
- ONT
1 stop7h 02m
Delta
Thu 6/49:50 am
ONT
- AUS
1 stop5h 46m
Delta
Deal found 2/23![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2711:10 am
AUS
- ONT
Nonstop3h 05m
Southwest
Sat 5/303:35 pm
ONT
- AUS
1 stop4h 40m
Southwest
Deal found 2/24![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/46:00 am
AUS
- ONT
1 stop8h 33m
Delta
Mon 6/810:59 pm
ONT
- AUS
1 stop8h 40m
Delta
Deal found 2/23![Delta logo]()
$318
Last-minute flights from Austin to OntarioDiscover last-minute flight deals from Austin to Ontario. Data last updated February 27, 2026 and is based on user searches.
Discover last-minute flight deals from Austin to Ontario. Data last updated February 27, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/48:30 am
AUS
- ONT
1 stop27h 04m
Frontier
Tue 3/312:23 pm
ONT
- AUS
1 stop26h 30m
Frontier
Deal found 2/25![Frontier logo]()
$212
This American Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:00 am
AUS
- ONT
1 stop4h 51m
American Airlines
Tue 3/245:02 pm
ONT
- AUS
1 stop4h 57m
American Airlines
Deal found 2/26![American Airlines logo]()
$218
This Orbitz deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2310:45 pm
AUS
- ONT
1 stop27h 14m
Frontier
Wed 4/14:52 pm
ONT
- AUS
1 stop26h 14m
Frontier
Deal found 2/24![Frontier logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2410:45 pm
AUS
- ONT
1 stop27h 14m
Frontier
Thu 4/210:50 am
ONT
- AUS
1 stop8h 16m
Frontier
Deal found 2/23![Frontier logo]()
$179
This CheapOair deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:45 am
AUS
- ONT
1 stop19h 14m
Frontier
Tue 3/312:23 pm
ONT
- AUS
1 stop26h 30m
Frontier
Deal found 2/24![Frontier logo]()
$191
This Delta deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/242:40 pm
AUS
- ONT
1 stop8h 20m
Delta
Thu 4/25:09 pm
ONT
- AUS
1 stop5h 30m
Delta
Deal found 2/25![Delta logo]()
$217
This Expedia deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:45 am
AUS
- ONT
1 stop19h 14m
Frontier
Wed 4/14:52 pm
ONT
- AUS
1 stop26h 14m
Frontier
Deal found 2/25![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2710:55 pm
AUS
- ONT
1 stop16h 33m
Frontier
Sun 4/56:20 am
ONT
- AUS
1 stop16h 01m
Frontier
Deal found 2/25![Frontier logo]()
$216
This Kiwi.com deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/314:14 pm
AUS
- ONT
2 stops25h 43m
Frontier
Thu 4/910:27 pm
ONT
- AUS
1 stop17h 45m
Frontier
Deal found 2/23![Frontier logo]()
$202
One-way flights from Austin to OntarioSearch for one-way flight options from Austin to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.
Search for one-way flight options from Austin to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.
This Trip.com deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:00 pm
AUS
- ONT
1 stop12h 55m
Frontier
Deal found 2/27![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:13 pm
AUS
- ONT
1 stop7h 42m
Frontier
Deal found 2/24![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/279:47 pm
AUS
- ONT
1 stop28h 08m
Frontier
Deal found 2/25![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:47 pm
AUS
- ONT
1 stop28h 08m
Frontier
Deal found 2/25![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/49:47 pm
AUS
- ONT
1 stop28h 08m
Frontier
Deal found 2/24![Frontier logo]()
$71
This Trip.com deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:13 pm
AUS
- ONT
1 stop7h 42m
Frontier
Deal found 2/23![Frontier logo]()
$78
This Trip.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:00 am
AUS
- ONT
1 stop17h 55m
Frontier
Deal found 2/26![Frontier logo]()
$80
This Trip.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:31 pm
AUS
- ONT
1 stop12h 00m
Frontier
Deal found 2/25![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:13 pm
AUS
- ONT
1 stop7h 42m
Frontier
Deal found 2/24![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/179:31 pm
AUS
- ONT
1 stop28h 24m
Frontier
Deal found 2/26![Frontier logo]()
$85
Find flight deals from Austin to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Austin (AUS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $124 (Kiwi.com) |
One-way from | $60 (Trip.com) |
Popular in | December |
Cheapest in | August |
Average price | $401 |
Good round-trip deal | $278 or less |
Good one-way deal | $103 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Austin to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 27, 2026.
Use the filters below to find and compare flights from Austin to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Wed 5/13
2:45 pm-8:35 pm
1 stop7h 50m
Ontario
Wed 5/20
2:25 pm-10:05 pm
1 stop5h 40m
$216
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Tue 6/2
6:32 pm-11:34 pm
1 stop7h 02m
Ontario
Thu 6/11
9:55 am-5:32 pm
1 stop5h 37m
$217
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Wed 6/3
6:32 pm-11:34 pm
1 stop7h 02m
Ontario
Fri 6/12
1:00 pm-9:14 pm
1 stop6h 14m
$217
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Mon 7/20
7:25 pm-11:44 pm
1 stop6h 19m
Ontario
Mon 7/27
9:55 am-5:32 pm
1 stop5h 37m
$279
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Mon 6/1
6:32 pm-11:34 pm
1 stop7h 02m
Ontario
Thu 6/4
9:50 am-5:36 pm
1 stop5h 46m
$287
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Tue 3/10
7:15 am-3:08 pm
1 stop9h 53m
Ontario
Wed 3/25
6:00 am-12:34 am
1 stop16h 34m
$297
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Sat 4/25
7:00 am-5:47 pm
2 stops12h 47m
Ontario
Sat 5/2
1:30 pm-10:57 pm
1 stop7h 27m
$298
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Sat 4/18
7:00 am-5:47 pm
2 stops12h 47m
Ontario
Sat 4/25
6:05 am-1:04 pm
1 stop4h 59m
$303
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Wed 6/24
5:41 pm-11:54 pm
1 stop8h 13m
Ontario
Wed 7/1
2:09 pm-12:34 am
1 stop8h 25m
$307
AustinOntario
AUS - ONT
AUSONT
Austin Bergstrom
Thu 6/4
6:00 am-12:33 pm
1 stop8h 33m
Ontario
Mon 6/8
10:59 pm-9:39 am
1 stop8h 40m
$318
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Austin to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Austin to Ontario in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Austin-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Austin-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Austin-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Austin-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Austin-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Austin to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Austin with our price prediction graph.
AUS-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Austin to Ontario
Prices
More
How far ahead should I book a flight from Austin to Ontario?
Use this chart to determine the optimal time to book a round-trip flight from Austin to Ontario. Price data was last updated on February 20, 2026.
To ensure you get the cheapest price possible for a flight from Austin to Ontario, you should look to book at least 56 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Austin to Ontario?
Currently, September is the cheapest month in which you can book a flight from Austin to Ontario (average of $60). Flying from Austin to Ontario in February is currently the most expensive (average of $117). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from AUS to ONT?
Find hourly flight availability from Austin to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 27, 2026.
When flying from Austin to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 25% versus a flight in the morning.
What’s the top layover airport for flights from Austin to Ontario?
Share of 1-stop round-trip flights from Austin to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.
Phoenix (PHX) – chosen by Cheapflights users on 75% of 1-stop itineraries from Austin to Ontario on Cheapflights.
What’s the cheapest layover airport for flights from Austin to Ontario?
Average round-trip fare for 1-stop flights from Austin to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Dallas (DFW) is the most affordable 1-stop option, with an average round-trip price of $440.
What’s the fastest layover option from Austin to Ontario?
Shortest average travel time for 1-stop one-way flights from Austin to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 4h 42m.
Which airport typically offers the quickest layover for flights from Austin to Ontario?
Average layover duration for 1-stop one-way flights from Austin to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 0h 48m.
The best insider tips for Austin to Ontario flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Austin to Ontario trip
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Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated February 27, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and American Airlines from Austin to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from Austin to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 27, 2026.
Austin and Ontario flights
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Top 4 airlines flying from Austin to Ontario
Discover the top 4 airlines that operate flights from Austin to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$156 | Average$222 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$300 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$384 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$397 | FlexibilityNo cancel fee | On-time63% |