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Cheap flights from Ontario to Austin from $57

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Austin departing on 12/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Austin

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:00 am - 1:23 pmONT-AUS
27h 23m1 stop
Frontier Logo
4:09 pm - 8:42 pmAUS-ONT
6h 33m1 stop
$132Frontier
Find Deal
Wed, Nov 5 - Sat, Nov 8
Frontier Logo
6:00 am - 1:23 pmONT-AUS
5h 23m1 stop
Frontier Logo
7:14 pm - 9:57 pmAUS-ONT
4h 43m1 stop
$144Frontier
Find Deal
Thu, Nov 6 - Mon, Nov 10
Frontier Logo
12:05 pm - 11:16 pmONT-AUS
9h 11m1 stop
Frontier Logo
7:14 pm - 7:17 amAUS-ONT
14h 03m1 stop
$145Frontier
Find Deal
Sat, Nov 1 - Sun, Nov 16
Frontier Logo
8:00 am - 1:23 pmONT-AUS
27h 23m1 stop
Frontier Logo
10:37 am - 11:10 amAUS-ONT
26h 33m1 stop
$146Frontier
Find Deal
Wed, Nov 5 - Fri, Nov 7
Frontier Logo
3:26 pm - 11:45 amONT-AUS
18h 19m1 stop
Frontier Logo
2:56 pm - 2:33 pmAUS-ONT
25h 37m2 stops
$151Frontier
Find Deal
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
8:45 am - 8:42 pmONT-AUS
9h 57m1 stop
Frontier Logo
6:00 am - 11:10 amAUS-ONT
7h 10m1 stop
$156Frontier
Find Deal
Wed, Nov 5 - Thu, Nov 6
Frontier Logo
10:42 pm - 11:16 pmONT-AUS
22h 34m2 stops
Frontier Logo
7:45 am - 9:27 pmAUS-ONT
15h 42m1 stop
$157Frontier
Find Deal
Fri, Nov 14 - Tue, Nov 18
Frontier Logo
6:00 am - 1:23 pmONT-AUS
5h 23m1 stop
Frontier Logo
10:37 am - 11:10 amAUS-ONT
26h 33m1 stop
$158Frontier
Find Deal
Mon, Nov 3 - Fri, Nov 7
Multiple Airlines Logo
8:00 am - 1:26 pmONT-AUS
27h 26m2 stops
Multiple Airlines Logo
10:06 pm - 2:26 pmAUS-ONT
18h 20m1 stop
$251Multiple Airlines
Find Deal
Tue, Nov 18 - Tue, Nov 25
Multiple Airlines Logo
8:45 am - 8:42 pmONT-AUS
9h 57m1 stop
Multiple Airlines Logo
6:39 am - 9:06 pmAUS-ONT
16h 27m2 stops
$279Multiple Airlines
Find Deal
Wed, Nov 19 - Mon, Nov 24

Frontier flights from Ontario to Austin

Our best Frontier deals on Ontario to Austin flight tickets
Frontier
Nov 5
ONT8:00 amOntario
27h 23m
1 stop
AUS1:23 pmAustin Bergstrom
Nov 8
AUS4:09 pmAustin Bergstrom
6h 33m
1 stop
ONT8:42 pmOntario
$132
Find similar
Frontier
Nov 6
ONT6:00 amOntario
5h 23m
1 stop
AUS1:23 pmAustin Bergstrom
Nov 10
AUS7:14 pmAustin Bergstrom
4h 43m
1 stop
ONT9:57 pmOntario
$144
Find similar
Frontier
Nov 1
ONT12:05 pmOntario
9h 11m
1 stop
AUS11:16 pmAustin Bergstrom
Nov 16
AUS7:14 pmAustin Bergstrom
14h 03m
1 stop
ONT7:17 amOntario
$145
Find similar

Southwest flights from Ontario to Austin

Our best Southwest deals on Ontario to Austin flight tickets
Southwest
Oct 30
ONT5:20 amOntario
4h 05m
1 stop
AUS11:25 amAustin Bergstrom
Nov 2
AUS2:45 pmAustin Bergstrom
3h 15m
ONT4:00 pmOntario
$657
Find similar
Southwest
Oct 30
ONT10:45 amOntario
2h 45m
AUS3:30 pmAustin Bergstrom
Nov 1
AUS4:55 pmAustin Bergstrom
5h 00m
1 stop
ONT7:55 pmOntario
$735
Find similar
Southwest
Oct 25
ONT1:50 pmOntario
4h 30m
1 stop
AUS8:20 pmAustin Bergstrom
Oct 26
AUS4:40 pmAustin Bergstrom
3h 05m
ONT5:45 pmOntario
$827
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Austin 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, momondo users made 832,500 searches. Data last updated October 20, 2025.
Use the filters below to find and compare flights from Ontario to Austin that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Wed 11/5

8:00 am-1:23 pm

1 stop27h 23m

Austin Bergstrom

Sat 11/8

4:09 pm-8:42 pm

1 stop6h 33m

$132

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Thu 11/6

6:00 am-1:23 pm

1 stop5h 23m

Austin Bergstrom

Mon 11/10

7:14 pm-9:57 pm

1 stop4h 43m

$144

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Sat 11/1

12:05 pm-11:16 pm

1 stop9h 11m

Austin Bergstrom

Sun 11/16

7:14 pm-7:17 am

1 stop14h 03m

$145

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Wed 11/5

8:00 am-1:23 pm

1 stop27h 23m

Austin Bergstrom

Fri 11/7

10:37 am-11:10 am

1 stop26h 33m

$146

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Thu 1/8

3:26 pm-11:45 am

1 stop18h 19m

Austin Bergstrom

Mon 1/12

2:56 pm-2:33 pm

2 stops25h 37m

$151

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Wed 11/5

8:45 am-8:42 pm

1 stop9h 57m

Austin Bergstrom

Thu 11/6

6:00 am-11:10 am

1 stop7h 10m

$156

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 11/14

10:42 pm-11:16 pm

2 stops22h 34m

Austin Bergstrom

Tue 11/18

7:45 am-9:27 pm

1 stop15h 42m

$157

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Mon 11/3

6:00 am-1:23 pm

1 stop5h 23m

Austin Bergstrom

Fri 11/7

10:37 am-11:10 am

1 stop26h 33m

$158

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Tue 11/18

8:00 am-1:26 pm

2 stops27h 26m

Austin Bergstrom

Tue 11/25

10:06 pm-2:26 pm

1 stop18h 20m

$251

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Wed 11/19

8:45 am-8:42 pm

1 stop9h 57m

Austin Bergstrom

Mon 11/24

6:39 am-9:06 pm

2 stops16h 27m

$279

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Austin from

How to get the cheapest flight ticket from Ontario to Austin

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Austin?

The cheapest month to fly to Austin from Ontario is in April. Flight prices, which tend to average around $259, are often lower during this time because this is during the off-season. If you’re not able to fly to Austin in April, then September is your next best option. Flight prices from Ontario to Austin during September average around $279.

What is the cheapest day to depart on your flight to Austin?

The cheapest day to depart on your flight to Austin is on a Saturday when prices can be found for as low as $314. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Austin for around $383.

What is the cheapest time of day to depart on your flight to Austin?

In the afternoon is the cheapest time of day to fly from Ontario to Austin when you can find flight prices for as low as $329. Flying to Austin in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Austin are more costly in the evening, with an average ticket price of $357. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Ontario to Austin Bergstrom flight route?

Fly from Ontario to Austin Bergstrom for the best Ontario - Austin Bergstrom flight prices

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

You are more likely to see cheaper flights to Austin from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Austin for around $324 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Austin from Ontario for as low as $271 on momondo.

What cabin class options are available on Ontario to Austin Bergstrom flights?

There is only 1 cabin class available to choose from on Ontario to Austin Bergstrom flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Ontario to Austin flight prices changed over time?

As of October 2025, prices for Ontario to Austin flights are approximately 4% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Austin

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Austin according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Austin (ONT to AUS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Austin

Best Price Found

$197

Fastest flight time

2h 40m

Direct flights

Every day

Airports in Austin

1 airport
The best one-way flight to Austin from Ontario in the past 72 hours is $197. The best round-trip flight deal from Ontario to Austin found on momondo in the last 72 hours is $386.
The fastest flight from Ontario to Austin takes 2h 40m
Direct flights go from Ontario to Austin every day.
There is 1 airport near Austin: Austin Bergstrom (AUS)
Search flight deals

  • How far is Ontario to Austin Bergstrom by plane?

    Ontario and Austin Bergstrom are 1190.2 mi apart from one another. Typically, this will take 5h 19m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to Austin Bergstrom Airport?

    Prices for flights from Ontario Airport to Austin Bergstrom Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Austin Bergstrom Airport?

  • How old do you have to be to fly from Ontario Airport to Austin Bergstrom Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Austin Bergstrom Airport.

  • What documentation or ID do you need to fly to Austin Bergstrom Airport?

    The required travel and health documents for your Austin Bergstrom Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Austin Bergstrom Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Ontario to Austin?

  • What is the most popular airline from Ontario to Austin?

Best airlines flying from Ontario to Austin

Compare and see reviews for airlines that fly from Ontario to Austin with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $120Free CancellationRating
7.9
7,978 reviews
Search Delta flights
FrontierPriceFrom $130Free CancellationRating
5.8
3,130 reviews
Search Frontier flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,023 reviews
Search American Airlines flights
SouthwestPriceFrom $234Free CancellationRating
8.0
4,238 reviews
Search Southwest flights

  • Southwest Flights From Ontario to Austin

    Southwest is one of the most popular airlines flying from Ontario to Austin, operating 4 flights/week on average for this route. A good Southwest flight deal for Ontario to Austin starts from $234 round-trip, up to an average price of $358. Our users have rated Southwest at 8.0/10.

Traveling to a place near Austin?

Book flights to Austin if you plan to visit one of these locations
Fredericksburg
Wimberley
San Marcos
Round Rock
Georgetown
Canyon Lake
Marble Falls
Cedar Park
Horseshoe Bay
Dripping Springs
Pflugerville
Seguin
Kyle
Bastrop
Buda
Flatonia

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Austin?

It is quick and easy to find Ontario to Austin flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Austin that suits you.

Can I find flights from Ontario to Austin with flexible booking policies on momondo?

Flights from Ontario to Austin with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to Austin?

Once you have performed a search for Ontario to Austin flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to Austin right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Austin flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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