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Cheap Flights from Austin (AUS) to Ontario (ONT)

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      Travellers and cabin class, 1 Adult, Economy
      Southwest Airlines

      Compare Austin-Bergstrom to Ontario International flight deals

      Find the cheapest month or even day of the year to fly to Ontario International

      Book the best Ontario International fare with no extra fees

      Flight deals from Austin-Bergstrom to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Austin-Bergstrom Airport to Ontario International Airport? If you want to travel next month, return fares start from $262. Find the lowest prices on one-way and return tickets right here.
      Ontario.$257 per passenger.Departing Thu, 5 Nov, returning Mon, 16 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Thu, 5 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 16 Nov, arriving in Austin-Bergstrom.Price includes taxes and charges.From $257, select.
      Ontario.$262 per passenger.Departing Wed, 30 Sep, returning Sat, 3 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 3 Oct, arriving in Austin-Bergstrom.Price includes taxes and charges.From $262, select.
      Ontario.$262 per passenger.Departing Wed, 16 Sep, returning Tue, 22 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Wed, 16 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 22 Sep, arriving in Austin-Bergstrom.Price includes taxes and charges.From $262, select.
      Ontario.$265 per passenger.Departing Thu, 1 Oct, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Thu, 1 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Austin-Bergstrom.Price includes taxes and charges.From $265, select.
      Ontario.$314 per passenger.Departing Wed, 25 Nov, returning Wed, 2 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Wed, 25 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 2 Dec, arriving in Austin-Bergstrom.Price includes taxes and charges.From $314, select.
      Ontario.$320 per passenger.Departing Thu, 5 Nov, returning Mon, 16 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Thu, 5 Nov, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Mon, 16 Nov, arriving in Austin-Bergstrom.Price includes taxes and charges.From $320, select.
      Ontario.$379 per passenger.Departing Sat, 5 Dec, returning Wed, 9 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Austin-Bergstrom on Sat, 5 Dec, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 9 Dec, arriving in Austin-Bergstrom.Price includes taxes and charges.From $379, select.
      Ontario.$386 per passenger.Departing Wed, 23 Sep, returning Tue, 29 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Wed, 23 Sep, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Tue, 29 Sep, arriving in Austin-Bergstrom.Price includes taxes and charges.From $386, select.
      Ontario.$386 per passenger.Departing Tue, 6 Oct, returning Wed, 14 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Tue, 6 Oct, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 14 Oct, arriving in Austin-Bergstrom.Price includes taxes and charges.From $386, select.
      Ontario.$387 per passenger.Departing Wed, 28 Oct, returning Mon, 2 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Wed, 28 Oct, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Mon, 2 Nov, arriving in Austin-Bergstrom.Price includes taxes and charges.From $387, select.
      Ontario.$389 per passenger.Departing Wed, 6 Jan, returning Mon, 11 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Wed, 6 Jan, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Mon, 11 Jan, arriving in Austin-Bergstrom.Price includes taxes and charges.From $389, select.
      Ontario.$389 per passenger.Departing Sat, 5 Dec, returning Tue, 8 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Sat, 5 Dec, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Tue, 8 Dec, arriving in Austin-Bergstrom.Price includes taxes and charges.From $389, select.
      Ontario.$390 per passenger.Departing Tue, 15 Dec, returning Wed, 6 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Tue, 15 Dec, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 6 Jan, arriving in Austin-Bergstrom.Price includes taxes and charges.From $390, select.
      Ontario.$412 per passenger.Departing Mon, 1 Mar, returning Wed, 31 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Austin-Bergstrom on Mon, 1 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 31 Mar, arriving in Austin-Bergstrom.Price includes taxes and charges.From $412, select.
      Ontario.$416 per passenger.Departing Wed, 17 Feb, returning Wed, 24 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Austin-Bergstrom on Wed, 17 Feb, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 24 Feb, arriving in Austin-Bergstrom.Price includes taxes and charges.From $416, select.
      Ontario.$449 per passenger.Departing Sun, 27 Sep, returning Mon, 23 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Austin-Bergstrom on Sun, 27 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 23 Nov, arriving in Austin-Bergstrom.Price includes taxes and charges.From $449, select.

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

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Austin-Bergstrom to Ontario International flights are currently cheapest in November.
      Aug
      from $489
      Sep
      from $262
      Oct
      from $265
      Nov
      from $257
      Dec
      from $379
      Jan
      from $389
      Feb
      from $416
      Mar
      from $412
      Apr
      from $582
      May
      Find prices
      Jun
      Find prices
      Jul
      Find prices

      Direct flights from Austin-Bergstrom to Ontario International

      Southwest Airlines

      Austin-Bergstrom to Ontario International: Alternative routes

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

      Ontario International

      4km from central Ontario
      Closest
      from $257
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from $335
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from $400
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      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      from $387
      Search flights

      Los Angeles International

      71km from central Ontario
      Cheapest
      from $209
      Search flights

      Austin to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found$257
      Cheapest month to flyNovember
      Average flight time3 hrs, 7 mins
      Most popular airlineSouthwest Airlines
      Average flights per week6

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

      The best price we found for a return flight from Austin-Bergstrom to Ontario International is $257. 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.
      3 hours and 7 minutes is the average flight time from Austin-Bergstrom to Ontario International.
      Southwest Airlines flies direct from Austin-Bergstrom to Ontario International.
      As of August 2026, there are 6 flights per week flying from Austin-Bergstrom to Ontario International.
      The cheapest month to fly from Austin-Bergstrom to Ontario International is usually November.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Austin-Bergstrom Airport to Ontario International Airport on Thursday, 5 November 2026.
      Yes – the average flight time is 3 hours and 7 minutes.
      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 Ontario International 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.

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

      Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Ontario International.

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

      • Jump on a direct flight from Austin-Bergstrom Airport to Ontario International Airport and you'll be travelling for an average of 3 hours.

      • The timezone in Ontario is UTC-8, which is two hours behind Austin.

      • Each week, there are four Austin-Bergstrom Airport to Ontario International Airport flights. If you prefer to jet off as soon as possible, pick the 11:35 Southwest Airlines flight. If you'd rather make the most of your time before flying, the latest flight is at 21:30 with Southwest Airlines.

      • Leave enough time to catch your AUS to ONT flight. As a general rule, turn up at least two hours before international departures and an hour ahead for domestic flights.

      • Flying during a peak time such as July? Major public holidays and other high seasons can lead to longer lines and delays at check-in and security. Play it safe and get there up to four hours ahead of international flights and two hours before domestic departures.

      • Southwest Airlines has direct flights from Austin-Bergstrom Airport to Ontario International Airport. Book with this popular airline, then get ready to discover the sights in Ontario — and maybe even more of the United States if you have time.

      • Southwest Airlines has the highest passenger demand on this route.

      • Southwest Airlines is the most punctual carrier operating AUS to ONT flights, with 75.0% of its services arriving as planned.

      • If you want to break up your flight, simply deselect 'Direct flights only' when searching for your ticket from Austin-Bergstrom Airport to Ontario International Airport. These are the most popular stopovers between AUS and ONT:

        • Dallas Fort Worth International Airport

        • Phoenix Sky Harbour Airport

        • Harry Reid International Airport

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

      • The lowest price we've found for a one-way Austin-Bergstrom Airport to Ontario International Airport flight is $127. A return plane ticket is currently $257. Depending on the availability when you book, these fares may change.

      • To score cheap tickets from AUS to ONT, book your trip three months before your planned departure.

      • The cheapest month for flights from Austin-Bergstrom Airport to Ontario International Airport is August. Use the 'Whole month' tool to find the lowest prices if you have a flexible travel schedule.

      • Stay on top of deals for cheap flights from AUS to ONT by setting up a Price Alert. We'll send you an email or notification on the app when a lower fare pops up.

      • Choose your ideal departure and arrival times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to find the best deals on flights from Austin-Bergstrom Airport to Ontario International Airport.

      Handy information about Austin-Bergstrom Airport (AUS)

      • The address for AUS is 3600 Presidential Blvd.

      • Of the flights that depart from Austin-Bergstrom Airport, 77% land on time at their destination.

      • To get to Austin-Bergstrom Airport from central Austin, it'll take about 20 minutes if you're going by car. Of course, this depends on traffic conditions. It's approximately 16 kilometres from the airport to the city centre.

      • Planning to catch public transport? You can expect a journey time of around 45 minutes.

      • Get your break off to a hassle-free start by staying near AUS. Whether you have an early flight from Austin-Bergstrom Airport to Ontario International Airport or just don't want to be rushed, these hotels are ideal:

      Arriving at Ontario International Airport (ONT)

      When to fly to Ontario International Airport (ONT)

      • The quietest month for a flight from Austin-Bergstrom Airport to Ontario International Airport is March, while July is the busiest. Choose the best time to go to Ontario based on whether you prefer a bustling atmosphere or a more laid-back vibe.

      • The warmest month in Ontario is August, with temperatures ranging between 16ºC (61ºF) and 36ºC (97ºF). Book your flights from Austin-Bergstrom Airport to Ontario International Airport in this month if you enjoy this type of weather.

      • If you want to travel in cooler conditions, look for a cheap ticket from AUS to ONT in February. Temperatures average between 4ºC (39ºF) and 24ºC (75ºF) then.

      Explore more of the United States

      • Ontario has plenty going for it, but there are so many other parts of the United States waiting to be discovered. Around 56 kilometres west of Ontario, a trip to Los Angeles will keep you on the move. Check out popular attractions like Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • If there's time to check out another great destination in the United States, consider San Diego, roughly 153 kilometres south of Ontario. San Diego Zoo, San Diego Balboa Park and USS Midway Museum are key highlights.

      Plan smart, explore more

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      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.