Cheap Flights from Ontario International to Austin-Bergstrom

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Compare Ontario International to Austin-Bergstrom flight deals

Find the cheapest month or even day of the year to fly to Austin-Bergstrom

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Flight deals from Ontario International to Austin-Bergstrom

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Austin-Bergstrom Airport? If you want to travel next month, return fares start from $303. Find the lowest prices on one-way and return tickets right here.

Austin.$303 per passenger.Departing Sat, 17 Oct, returning Mon, 19 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 17 Oct, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Mon, 19 Oct, arriving in Ontario International.Price includes taxes and charges.From $303, select.

Austin.$318 per passenger.Departing Sat, 7 Nov, returning Mon, 9 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 7 Nov, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Mon, 9 Nov, arriving in Ontario International.Price includes taxes and charges.From $318, select.

Austin.$355 per passenger.Departing Fri, 30 Oct, returning Tue, 3 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 30 Oct, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Tue, 3 Nov, arriving in Ontario International.Price includes taxes and charges.From $355, select.

Austin.$368 per passenger.Departing Wed, 4 Nov, returning Mon, 7 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 4 Nov, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Mon, 7 Dec, arriving in Ontario International.Price includes taxes and charges.From $368, select.

Austin.$400 per passenger.Departing Wed, 2 Dec, returning Wed, 9 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 2 Dec, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Wed, 9 Dec, arriving in Ontario International.Price includes taxes and charges.From $400, select.

Austin.$409 per passenger.Departing Tue, 29 Sep, returning Wed, 30 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 29 Sep, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Wed, 30 Sep, arriving in Ontario International.Price includes taxes and charges.From $409, select.

Austin.$418 per passenger.Departing Wed, 30 Sep, returning Thu, 8 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 30 Sep, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Thu, 8 Oct, arriving in Ontario International.Price includes taxes and charges.From $418, select.

Austin.$509 per passenger.Departing Tue, 20 Oct, returning Thu, 22 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Tue, 20 Oct, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Thu, 22 Oct, arriving in Ontario International.Price includes taxes and charges.From $509, select.

Austin.$509 per passenger.Departing Thu, 18 Feb, returning Thu, 25 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Thu, 18 Feb, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Thu, 25 Feb, arriving in Ontario International.Price includes taxes and charges.From $509, select.

Austin.$509 per passenger.Departing Tue, 8 Dec, returning Tue, 15 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Tue, 8 Dec, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Tue, 15 Dec, arriving in Ontario International.Price includes taxes and charges.From $509, select.

Austin.$509 per passenger.Departing Thu, 7 Jan, returning Thu, 21 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Thu, 7 Jan, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Thu, 21 Jan, arriving in Ontario International.Price includes taxes and charges.From $509, select.

Austin.$510 per passenger.Departing Wed, 28 Oct, returning Mon, 2 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Wed, 28 Oct, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Mon, 2 Nov, arriving in Ontario International.Price includes taxes and charges.From $510, select.

Austin.$510 per passenger.Departing Tue, 3 Nov, returning Tue, 10 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Tue, 3 Nov, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Tue, 10 Nov, arriving in Ontario International.Price includes taxes and charges.From $510, select.

Austin.$510 per passenger.Departing Mon, 14 Dec, returning Thu, 25 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Mon, 14 Dec, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Thu, 25 Feb, arriving in Ontario International.Price includes taxes and charges.From $510, select.

Austin.$562 per passenger.Departing Wed, 4 Nov, returning Wed, 9 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Wed, 4 Nov, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Wed, 9 Dec, arriving in Ontario International.Price includes taxes and charges.From $562, select.

Austin.$579 per passenger.Departing Mon, 14 Dec, returning Sat, 16 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 14 Dec, arriving in Austin-Bergstrom.Inbound indirect flight with Southwest Airlines, departs from Austin-Bergstrom on Sat, 16 Jan, arriving in Ontario International.Price includes taxes and charges.From $579, select.

Find the cheapest month to fly from Ontario International to Austin-Bergstrom

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Austin-Bergstrom flights are currently cheapest in October.

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Direct flights from Ontario International to Austin-Bergstrom

Ontario International to Austin-Bergstrom: Alternative routes

Compare routes from Ontario International to Austin below. You may find an airport to fly into that's cheaper, faster, or easier than Austin-Bergstrom.

Austin-Bergstrom

10km from central Austin

ClosestCheapest

from $303

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Killeen Gray AAF

88km from central Austin

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Ontario to Austin: Flight information

The things to know before you go.

Cheapest flight found	$303
Cheapest month to fly	October
Average flight time	2 hrs, 47 mins
Most popular airline	Southwest Airlines
Average flights per week	8

Finding cheap flights from Ontario International to Austin-Bergstrom: Frequently asked questions

How much are return flights from Ontario International to Austin-Bergstrom?

The best price we found for a return flight from Ontario International to Austin-Bergstrom is $303. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Ontario International to Austin-Bergstrom?

2 hours and 47 minutes is the average flight time from Ontario International to Austin-Bergstrom.

Which airlines fly direct from Ontario International to Austin-Bergstrom?

Southwest Airlines flies direct from Ontario International to Austin-Bergstrom.

How many flights are there a week from Ontario International to Austin-Bergstrom?

As of September 2026, there are 8 flights per week flying from Ontario International to Austin-Bergstrom.

When is the cheapest time to fly from Ontario International to Austin-Bergstrom?

The cheapest month to fly from Ontario International to Austin-Bergstrom is usually October.

Which upcoming date is cheapest to fly from Ontario International Airport to Austin-Bergstrom Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Austin-Bergstrom Airport on Saturday, 17 October 2026.

Can I get a direct flight from Ontario International Airport to Austin-Bergstrom Airport?

Yes – the average flight time is 2 hours and 47 minutes.

How can I find the best flight deal to Austin-Bergstrom?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Austin-Bergstrom but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Austin?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Austin is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Ontario International Airport to Austin-Bergstrom with?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Austin-Bergstrom.

Flying from Ontario International Airport (ONT) to Austin-Bergstrom Airport (AUS): what you need to know

Hop on a direct flight from Ontario International Airport to Austin-Bergstrom Airport and you'll be travelling for an average of 2 hours 45 minutes.
Austin is two hours ahead of Ontario and follows the UTC-6 timezone.
Each week, there are four Ontario International Airport to Austin-Bergstrom Airport flights. If you'd like to jet off early, take the 06:00 Southwest Airlines flight. If you're eager to make the most of your day before you fly, the last departure is at 15:10 with Southwest Airlines.
Give yourself plenty of time to catch your ONT to AUS flight. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.
Flying during a peak month such as July? Major public holidays and other popular seasons can mean longer lines at check-in and security. Play things extra safe and arrive up to four hours before an international flight and two hours before a domestic departure.
Southwest Airlines has direct flights from Ontario International Airport to Austin-Bergstrom Airport. Book with this popular carrier, then get ready to discover the sights in Austin — and maybe even more of the United States if you have time.
Southwest Airlines is the top choice for travellers on this route.
Southwest Airlines is the most punctual carrier that offers ONT to AUS flights, with 78.45% of its services landing on time.
We make it a piece of cake to book a flight with a stopover. To see all your options for tickets from Ontario International Airport to Austin-Bergstrom Airport, uncheck 'Direct flights only.' Then, choose a flight offering a stop long enough to explore your chosen city. Top stopovers between ONT and AUS include:
- Denver International Airport
- Phoenix Sky Harbour Airport
- Harry Reid International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Austin-Bergstrom Airport (AUS)

At the moment, $126 is the cheapest price we've seen for a one-way Ontario International Airport to Austin-Bergstrom Airport flight. The best price for a return ticket is $303. Bear in mind that fares could change due to availability when booking.
Score cheap tickets from ONT to AUS by booking at least four months ahead. According to our research, that's the sweet spot for finding the biggest deals.
Schedule your trip for September. That's the cheapest month for flights from Ontario International Airport to Austin-Bergstrom Airport. If you're flexible with your travel dates, try out the 'Whole month' tool to see the lowest airfare across each month.
Finding cheap flights from ONT to AUS is a cinch with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you when a lower fare pops up.
Select your preferred arrival and departure times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from Ontario International Airport to Austin-Bergstrom Airport.

Handy information about Ontario International Airport (ONT)

ONT is located at 2900 E. Airport Drive.
Ontario International Airport has an excellent on-time performance, so you're less likely to experience disruptions. Departures from ONT touch down on schedule 83% of the time.
Central Ontario to Ontario International Airport is around 10 kilometres. Depending on traffic, it'll take you about 15 minutes to get there if you're ride-sharing, catching a taxi or driving.
The journey when using public transport usually takes 45 minutes.
Looking for a convenient hotel near ONT? If you've booked an early flight from Ontario International Airport to Austin-Bergstrom Airport, these accommodation options will put you moments from check-in:

Arriving at Austin-Bergstrom Airport (AUS)

If you're arriving on a late Ontario International Airport to Austin-Bergstrom Airport flight, nothing tops the convenience of being close to the terminal. Grab your bags from the carousel and then be showered and relaxing shortly after at one of these options near AUS:
Explore without limits with a Austin-Bergstrom Airport rental car. Pick up your wheels from Thrifty, Dollar or Easirent and discover more of Austin and beyond.
Reserving your vehicle from Austin-Bergstrom Airport around four weeks ahead boosts your odds of scoring a great price.

When to fly to Austin-Bergstrom Airport (AUS)

The quietest month for a flight from Ontario International Airport to Austin-Bergstrom Airport is March, while July is the most popular. Pick the ideal time to visit Austin based on whether you prefer a bustling atmosphere or a more laid-back vibe.
When booking your flight from Ontario International Airport to Austin-Bergstrom Airport, think about the type of weather you enjoy. August is the warmest month in Austin, with the temperature ranging from 23ºC to 41ºC.
Search for cheap tickets from ONT to AUS in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 3ºC and 19ºC on average.

Explore more of the United States

Houston is just one of the many places in the United States waiting to be discovered once you've taken in the sights of Austin. Around 241 kilometres away to the east, popular attractions include The Museum of Fine Arts, Houston, Beck Building, Houston Museum of Natural Science and The Menil Collection.
Around 121 kilometres south-west of Austin, San Antonio is another essential stop in the United States. Experience major highlights starting with San Antonio River Walk, San Antonio River walk and Alamo Plaza.