HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Australia

$465+ Cheap flights from Ontario (ONT) to Australia

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 3/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Australia 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.

Cheap flight deals from Ontario to Australia

Cheapest flights from Ontario to Australia
Explore the most affordable flight options available from Ontario to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 28, 2025.

This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:39 pmONT - BNE
1 stop18h 51mUnited Airlines
Mon 1/1211:40 amBNE - ONT
1 stop24h 03mUnited Airlines
Deal found 12/26$961
This United Airlines deal was found by Cheapflights users on 12/27. 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.
Mon 12/296:39 pmONT - BNE
1 stop18h 51mUnited Airlines
Wed 1/1411:40 amBNE - ONT
1 stop17h 38mUnited Airlines
Deal found 12/27$962
This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:39 pmONT - SYD
1 stop19h 36mUnited Airlines
Tue 1/1312:10 pmSYD - ONT
1 stop18h 08mUnited Airlines
Deal found 12/26$964
This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:39 pmONT - SYD
1 stop19h 36mUnited Airlines
Mon 1/1212:10 pmSYD - ONT
1 stop18h 08mUnited Airlines
Deal found 12/26$966
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/276:39 pmONT - BNE
1 stop18h 51mUnited Airlines
Thu 1/811:40 amBNE - ONT
1 stop24h 03mUnited Airlines
Deal found 12/25$969
This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2810:42 amONT - BNE
1 stop26h 48mUnited Airlines
Thu 1/811:40 amBNE - ONT
1 stop24h 03mUnited Airlines
Deal found 12/26$970
This United Airlines deal was found by Cheapflights users on 12/25. 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.
Thu 12/2511:59 pmONT - BNE
2 stops37h 31mUnited Airlines
Mon 1/1211:40 amBNE - ONT
1 stop17h 38mUnited Airlines
Deal found 12/25$974
This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:39 pmONT - SYD
1 stop19h 36mUnited Airlines
Wed 12/3112:10 pmSYD - ONT
1 stop16h 51mUnited Airlines
Deal found 12/26$974
This United Airlines deal was found by Cheapflights users on 12/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:39 pmONT - SYD
1 stop19h 36mUnited Airlines
Sat 1/172:00 pmSYD - ONT
1 stop17h 17mUnited Airlines
Deal found 12/26$977
This United Airlines deal was found by Cheapflights users on 12/27. 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 12/276:04 amONT - SYD
1 stop29h 56mUnited Airlines
Mon 1/1212:10 pmSYD - ONT
2 stops27h 48mUnited Airlines
Deal found 12/27$982
This Kissandfly.com deal was found by Cheapflights users on 12/27. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:39 pmONT - SYD
1 stop19h 36mLufthansa
Tue 1/1312:10 pmSYD - ONT
1 stop18h 08mLufthansa
Deal found 12/27$1,001
This Kissandfly.com deal was found by Cheapflights users on 12/27. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:39 pmONT - SYD
1 stop19h 36mLufthansa
Mon 1/1212:10 pmSYD - ONT
1 stop18h 08mLufthansa
Deal found 12/27$1,007

Find flight deals from Ontario to Australia

Keep the following information in mind while searching for Ontario to Australia flight deals. Data was last updated December 28, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$965
(United Airlines)

One-way from

$465
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$1,227
Provider with most accurate pricing for Los Angeles-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Sydney Kingsford Smith flights.
Search Deals
From Ontario to Australia
Search Deals
One-way flight from Ontario to Australia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($123 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Australia 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 December 28, 2025.
Use the filters below to find and compare flights from Ontario to Australia that are best for you.

Fly from

Ontario

Fly to

Australia

Route

Depart

Return

Price

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sun 3/8

6:37 pm-6:30 am

1 stop18h 53m

Brisbane

Mon 3/16

10:40 am-12:18 pm

1 stop18h 38m

$969

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sat 1/31

6:32 pm-7:30 am

1 stop18h 58m

Brisbane

Wed 2/4

11:40 am-5:50 pm

1 stop24h 10m

$969

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sun 1/25

1:53 pm-7:30 am

1 stop23h 37m

Brisbane

Sun 2/1

11:40 am-11:18 am

1 stop17h 38m

$970

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Fri 1/9

6:39 pm-7:30 am

1 stop18h 51m

Brisbane

Sun 1/25

11:40 am-5:43 pm

1 stop24h 03m

$970

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Fri 2/13

1:50 pm-7:30 am

1 stop23h 40m

Brisbane

Sun 2/22

11:40 am-12:38 pm

1 stop18h 58m

$970

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Wed 3/11

6:37 pm-6:30 am

1 stop18h 53m

Brisbane

Wed 4/1

10:30 am-12:14 pm

1 stop18h 44m

$970

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Thu 2/12

5:00 am-7:30 am

2 stops32h 30m

Brisbane

Thu 2/26

11:40 am-12:38 pm

1 stop18h 58m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 1/21

1:53 pm-6:20 am

1 stop21h 27m

Sydney Kingsford Smith

Sun 1/25

11:50 am-9:58 pm

1 stop29h 08m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 2/10

1:53 pm-6:20 am

1 stop21h 27m

Sydney Kingsford Smith

Mon 3/16

12:10 pm-12:18 pm

1 stop18h 08m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 3/18

6:37 pm-9:15 am

1 stop20h 38m

Sydney Kingsford Smith

Tue 5/26

10:20 am-12:20 pm

1 stop19h 00m

$974

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Ontario with our price prediction graph.
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 Ontario to Australia

What is the cheapest month to book a flight from Ontario to Australia?

Currently, August is the cheapest month in which you can book a flight from Ontario to Australia (average of $377). Flying from Ontario to Australia in December is currently the most expensive (average of $792). 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.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated December 28, 2025.
Get a feel of what it's like to fly with United Airlines from Ontario to Australia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,113 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,113 reviews
United Airlines
7.4
Good
9,113 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Australia?

    If you book a flight to Australia from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Ontario to Australia?

    For as low as $969, United Airlines can have you in Australia from Ontario in 18h 53m. There are 7207 mi between Ontario and Australia. This flight may include one or multiple stops.

  • What are the most popular routes from Ontario to Australia?

    While some choose either Ontario - Melbourne or Ontario - Brisbane, Ontario - Sydney Kingsford Smith is the most popular route from Ontario to Australia.

  • Can I find deals for flights from Ontario to Australia that include hotel bookings?

    Yes. In addition to deals on Ontario to Australia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Australia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Australia.

  • Can I find deals for business class flights from Ontario to Australia?

    Yes. Cheapflights offers flight deals from Ontario to Australia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Australia?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Australia (average of $377). Flying from Ontario to Australia in December is currently the most expensive (average of $792). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Australia

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
Los Angeles to Auckland flights
Los Angeles to Melbourne flights
Los Angeles to Papeete flights
San Francisco to Sydney flights
San Francisco to Auckland flights
San Francisco to Papeete flights
San Francisco to Melbourne flights
Los Angeles to Brisbane flights
Ontario to Sydney flights
Ontario to Auckland flights
Santa Ana to Auckland flights
Santa Ana to Sydney flights
Los Angeles to Avalon flights
Los Angeles to Nadi flights
San Francisco to Brisbane flights
Los Angeles to Christchurch flights
Ontario to Melbourne flights
Ontario to Papeete flights
San Francisco to Christchurch flights
Los Angeles to Vaitape flights
Santa Ana to Melbourne flights
Long Beach to Papeete flights
Los Angeles to Queenstown flights
San Francisco to Nadi flights
San Diego to Melbourne flights
Los Angeles to Adelaide flights
San Francisco to Avalon flights
Los Angeles to Apia flights
Sacramento to Sydney flights
Ontario to Queenstown flights
Ontario to Nadi flights
San Diego to Auckland flights
Santa Ana to Papeete flights
Las Vegas to Auckland flights
Santa Ana to Queenstown flights
Burbank to Papeete flights
San Jose to Sydney flights
San Diego to Sydney flights
Long Beach to Sydney flights
Los Angeles to Tamuning flights
San Francisco to Vaitape flights
Las Vegas to Sydney flights
San Diego to Papeete flights
San Francisco to Tamuning flights
Los Angeles to Cairns flights
Santa Ana to Nadi flights
Ontario to Brisbane flights
Reno to Auckland flights
Los Angeles to Rarotonga flights

Top airline flying from Ontario to Australia

Discover the top airline that operate flights from Ontario to Australia. 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 December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,210FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights