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$435+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Cheap flight deals from Ontario to Australia

Keep the following information in mind while searching for Ontario to Australia flight deals. Data was last updated November 13, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$963
(United Airlines)

One-way from

$435
(Delta)

Popular in

December

Cheapest in

February

Average price

$974
Provider with most accurate pricing for Los Angeles-Sydney Kingsford Smith flight deals.
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From Ontario to Australia
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One-way flight from Ontario to Australia
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Highest demand for flights based on searches. 13% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 13, 2025.

This American Airlines deal was found by Cheapflights users on 11/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:47 amONT - BNE
2 stops24h 13mAmerican Airlines
Wed 11/197:40 pmBNE - ONT
2 stops31h 21mAmerican Airlines
Deal found 11/13$928
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Tue 12/306:39 pmONT - BNE
1 stop18h 51mUnited Airlines
Thu 1/1511:40 amBNE - ONT
1 stop24h 03mUnited Airlines
Deal found 11/13$967
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Tue 12/305:05 amONT - BNE
2 stops32h 25mUnited Airlines
Mon 1/1211:40 amBNE - ONT
2 stops28h 18mUnited Airlines
Deal found 11/13$971
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Wed 11/126:38 pmONT - SYD
1 stop19h 37mUnited Airlines
Tue 11/1811:50 amSYD - ONT
1 stop28h 59mUnited Airlines
Deal found 11/11$971
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/176:38 pmONT - SYD
1 stop19h 37mUnited Airlines
Fri 11/2112:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 11/12$974
This United Airlines deal was found by Cheapflights users on 11/12. 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.
Wed 11/195:05 amONT - SYD
2 stops33h 10mUnited Airlines
Mon 11/2411:50 amSYD - ONT
1 stop28h 59mUnited Airlines
Deal found 11/12$976
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/156:05 amONT - SYD
1 stop29h 55mUnited Airlines
Sat 11/2212:10 pmSYD - ONT
1 stop24h 24mUnited Airlines
Deal found 11/12$977
This United Airlines deal was found by Cheapflights users on 11/13. 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 11/171:29 pmONT - SYD
2 stops24h 46mUnited Airlines
Fri 11/2812:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 11/13$979
This United Airlines deal was found by Cheapflights users on 11/11. 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 11/151:29 pmONT - SYD
2 stops24h 46mUnited Airlines
Sat 11/2912:10 pmSYD - ONT
1 stop24h 24mUnited Airlines
Deal found 11/11$981
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/135:05 amONT - SYD
2 stops33h 10mUnited Airlines
Thu 11/2012:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 11/12$982
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Wed 11/125:05 amONT - SYD
2 stops57h 10mUnited Airlines
Wed 11/1911:50 amSYD - ONT
2 stops27h 54mUnited Airlines
Deal found 11/11$992
This United Airlines deal was found by Cheapflights users on 11/13. 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 12/291:40 pmONT - SYD
2 stops45h 40mUnited Airlines
Thu 1/1511:50 amSYD - ONT
1 stop29h 08mUnited Airlines
Deal found 11/13$993

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 November 13, 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

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 3/9

7:15 pm-9:15 am

1 stop20h 00m

Sydney Kingsford Smith

Mon 3/23

12:10 pm-12:17 pm

1 stop18h 07m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 2/10

1:53 pm-6:20 am

1 stop21h 27m

Sydney Kingsford Smith

Sun 2/15

12:10 pm-12:38 pm

1 stop19h 28m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 3/26

7:15 pm-9:15 am

1 stop20h 00m

Sydney Kingsford Smith

Tue 4/7

10:20 am-12:20 pm

1 stop19h 00m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 12/1

1:40 pm-9:15 am

1 stop24h 35m

Sydney Kingsford Smith

Fri 12/5

12:10 pm-5:37 pm

1 stop24h 27m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 12/8

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Fri 12/12

2:00 pm-12:18 pm

1 stop17h 18m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 3/17

6:02 am-7:00 am

1 stop30h 58m

Sydney Kingsford Smith

Sat 4/4

11:20 am-9:55 am

1 stop16h 35m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 1/23

1:53 pm-9:15 am

1 stop24h 22m

Sydney Kingsford Smith

Mon 1/26

12:10 pm-11:18 am

1 stop18h 08m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 11/29

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

Sun 12/14

2:00 pm-12:18 pm

1 stop17h 18m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 3/3

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Tue 3/17

11:50 am-8:45 pm

2 stops26h 55m

$976

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 3/3

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Wed 3/18

11:50 am-8:45 pm

2 stops26h 55m

$976

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 60 results
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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 $812). 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.

What is the cheapest time of day to fly from ONT to AU?

Find hourly flight availability from Ontario to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

One of the essential ways to save on airfare from Ontario to Australia is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 19% on airfare.

What is the cheapest day to fly from Ontario to Australia?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Australia flight should consider departing on Friday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 13, 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
9,015 reviews

Crew

8.1

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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
9,015 reviews
United Airlines
7.4
Good
9,015 reviews

Crew

8.1

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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 $971, United Airlines can have you in Australia from Ontario in 20h. There are 7534 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 $812). 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

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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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,206FlexibilityNo cancel feeOn-time69%

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