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Cheap flights from Ontario to Austin from $45

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 2/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
6:20 am - 12:16 amONT-AUS
15h 56m1 stop
Frontier Logo
6:45 am - 10:39 pmAUS-ONT
17h 54m1 stop
$110Frontier
Find Deal
Thu, Feb 5 - Tue, Feb 10
Frontier Logo
6:20 am - 7:27 pmONT-AUS
11h 07m1 stop
Frontier Logo
8:22 pm - 10:39 pmAUS-ONT
28h 17m1 stop
$124Frontier
Find Deal
Fri, Feb 6 - Mon, Feb 9
Frontier Logo
6:00 am - 4:18 pmONT-AUS
8h 18m1 stop
Frontier Logo
4:43 pm - 4:20 pmAUS-ONT
25h 37m1 stop
$127Frontier
Find Deal
Mon, Jan 5 - Sat, Jan 10
Frontier Logo
3:20 pm - 12:14 amONT-AUS
6h 54m1 stop
Frontier Logo
6:55 am - 2:25 pmAUS-ONT
9h 30m1 stop
$128Frontier
Find Deal
Fri, Dec 5 - Mon, Dec 8
Frontier Logo
6:15 am - 4:18 pmONT-AUS
8h 03m1 stop
Frontier Logo
10:22 pm - 9:17 pmAUS-ONT
24h 55m1 stop
$138Frontier
Find Deal
Fri, Dec 12 - Sun, Dec 14
Frontier Logo
2:59 pm - 4:18 pmONT-AUS
23h 19m1 stop
Frontier Logo
7:22 pm - 4:31 pmAUS-ONT
23h 09m1 stop
$140Frontier
Find Deal
Thu, Dec 11 - Fri, Dec 19
Frontier Logo
6:00 am - 4:18 pmONT-AUS
8h 18m1 stop
Frontier Logo
7:22 pm - 3:09 pmAUS-ONT
21h 47m1 stop
$141Frontier
Find Deal
Mon, Dec 22 - Mon, Jan 5
Frontier Logo
3:20 pm - 12:14 amONT-AUS
6h 54m1 stop
Frontier Logo
5:13 pm - 9:17 pmAUS-ONT
6h 04m1 stop
$142Frontier
Find Deal
Fri, Dec 5 - Fri, Dec 12
Frontier Logo
6:45 am - 12:14 amONT-AUS
15h 29m1 stop
Frontier Logo
7:22 pm - 3:09 pmAUS-ONT
21h 47m1 stop
$144Frontier
Find Deal
Fri, Dec 19 - Mon, Jan 5
Frontier Logo
12:58 am - 11:12 pmONT-AUS
20h 14m1 stop
Frontier Logo
2:13 pm - 2:25 pmAUS-ONT
26h 12m1 stop
$145Frontier
Find Deal
Mon, Dec 1 - Fri, Dec 5

Frontier flights from Ontario to Austin

Our best Frontier deals on Ontario to Austin flight tickets
Frontier
Feb 5
ONT6:20 amOntario
6h 01m
1 stop
AUS2:21 pmAustin Bergstrom
Feb 10
AUS6:45 amAustin Bergstrom
17h 54m
1 stop
ONT10:39 pmOntario
$110
Find similar
Frontier
Feb 6
ONT6:20 amOntario
11h 07m
1 stop
AUS7:27 pmAustin Bergstrom
Feb 9
AUS8:22 pmAustin Bergstrom
28h 17m
1 stop
ONT10:39 pmOntario
$124
Find similar
Frontier
Jan 5
ONT6:00 amOntario
8h 18m
1 stop
AUS4:18 pmAustin Bergstrom
Jan 10
AUS4:43 pmAustin Bergstrom
25h 37m
1 stop
ONT4:20 pmOntario
$127
Find similar

Southwest flights from Ontario to Austin

Our best Southwest deals on Ontario to Austin flight tickets
Southwest
Nov 26
ONT6:30 amOntario
7h 15m
2 stops
AUS3:45 pmAustin Bergstrom
Nov 30
AUS12:45 pmAustin Bergstrom
7h 00m
2 stops
ONT5:45 pmOntario
$632
Find similar
Southwest
Nov 25
ONT6:30 amOntario
7h 15m
2 stops
AUS3:45 pmAustin Bergstrom
Nov 29
AUS6:40 pmAustin Bergstrom
7h 15m
2 stops
ONT11:55 pmOntario
$638
Find similar
Southwest
Nov 25
ONT6:30 amOntario
7h 15m
2 stops
AUS3:45 pmAustin Bergstrom
Nov 29
AUS5:55 pmAustin Bergstrom
7h 00m
2 stops
ONT10:55 pmOntario
$668
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 November 18, 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

Thu 2/5

6:20 am-12:16 am

1 stop15h 56m

Austin Bergstrom

Tue 2/10

6:45 am-10:39 pm

1 stop17h 54m

$110

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 2/6

6:20 am-7:27 pm

1 stop11h 07m

Austin Bergstrom

Mon 2/9

8:22 pm-10:39 pm

1 stop28h 17m

$124

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Mon 1/5

6:00 am-4:18 pm

1 stop8h 18m

Austin Bergstrom

Sat 1/10

4:43 pm-4:20 pm

1 stop25h 37m

$127

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 12/5

3:20 pm-12:14 am

1 stop6h 54m

Austin Bergstrom

Mon 12/8

6:55 am-2:25 pm

1 stop9h 30m

$128

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 12/12

6:15 am-4:18 pm

1 stop8h 03m

Austin Bergstrom

Sun 12/14

10:22 pm-9:17 pm

1 stop24h 55m

$138

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Thu 12/11

2:59 pm-4:18 pm

1 stop23h 19m

Austin Bergstrom

Fri 12/19

7:22 pm-4:31 pm

1 stop23h 09m

$140

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Mon 12/22

6:00 am-4:18 pm

1 stop8h 18m

Austin Bergstrom

Mon 1/5

7:22 pm-3:09 pm

1 stop21h 47m

$141

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 12/5

3:20 pm-12:14 am

1 stop6h 54m

Austin Bergstrom

Fri 12/12

5:13 pm-9:17 pm

1 stop6h 04m

$142

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Fri 12/19

6:45 am-12:14 am

1 stop15h 29m

Austin Bergstrom

Mon 1/5

7:22 pm-3:09 pm

1 stop21h 47m

$144

OntarioAustin

ONT - AUS

ONTAUS

Ontario

Mon 12/1

12:58 am-11:12 pm

1 stop20h 14m

Austin Bergstrom

Fri 12/5

2:13 pm-2:25 pm

1 stop26h 12m

$145

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 $258, 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 $312. 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 $393.

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 $330. 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 $358. 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 $326 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.

Can stopping save me money on Ontario to Austin flights?

You could potentially save up to 43% on your flight if you consider stops on a Ontario to Austin flight.

How have Ontario to Austin flight prices changed over time?

As of November 2025, prices for Ontario to Austin flights are approximately 191% 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

Mon, Tue, Wed, Fri, Sat and Sun

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 $402.
The fastest flight from Ontario to Austin takes 2h 40m
Direct flights go from Ontario to Austin on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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 14m 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
8,007 reviews
Search Delta flights
FrontierPriceFrom $130Free CancellationRating
5.8
3,103 reviews
Search Frontier flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
SouthwestPriceFrom $234Free CancellationRating
8.0
4,245 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 $359. 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
Seguin
Pflugerville
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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