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$559+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Apr 26 — May 31
Sun 4/26
Sun 5/3
1 adult, Economy
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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 March 27, 2026.

This SmartFares deal was found by Cheapflights users on 3/23. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Sun 8/238:45 pm
SYD
-
ONT
1 stop17h 43m
Multiple Airlines
Deal found 3/23$959
This SmartFares deal was found by Cheapflights users on 3/24. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/199:40 am
ONT
-
SYD
1 stop40h 10m
Multiple Airlines
Thu 8/138:45 pm
SYD
-
ONT
1 stop18h 02m
Multiple Airlines
Deal found 3/24$1,008
This SmartFares deal was found by Cheapflights users on 3/22. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Thu 8/138:45 pm
SYD
-
ONT
1 stop18h 02m
Multiple Airlines
Deal found 3/22$1,009
This Alaska Airlines deal was found by Cheapflights users on 3/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/69:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Tue 8/188:45 pm
SYD
-
ONT
1 stop18h 02m
Multiple Airlines
Deal found 3/22$1,023
This United Airlines deal was found by Cheapflights users on 3/22. 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 4/266:49 pm
ONT
-
SYD
1 stop19h 06m
United Airlines
Sun 5/1010:20 am
SYD
-
ONT
1 stop16h 21m
United Airlines
Deal found 3/22$1,039
This United Airlines deal was found by Cheapflights users on 3/23. 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 4/211:27 pm
ONT
-
SYD
1 stop24h 28m
United Airlines
Wed 5/610:20 am
SYD
-
ONT
1 stop16h 21m
United Airlines
Deal found 3/23$1,048
This SmartFares deal was found by Cheapflights users on 3/24. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/139:40 am
ONT
-
SYD
1 stop40h 10m
Multiple Airlines
Thu 6/48:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 3/24$1,058
This SmartFares deal was found by Cheapflights users on 3/25. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Sun 8/98:45 pm
SYD
-
ONT
1 stop18h 02m
Multiple Airlines
Deal found 3/25$1,061
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/88:30 am
ONT
-
SYD
1 stop41h 20m
Multiple Airlines
Fri 5/158:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 3/24$1,062
This Expedia deal was found by Cheapflights users on 3/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/78:00 am
ONT
-
MEL
2 stops39h 50m
Multiple Airlines
Mon 9/148:50 pm
MEL
-
ONT
2 stops41h 38m
Multiple Airlines
Deal found 3/25$1,210
This Expedia deal was found by Cheapflights users on 3/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:11 am
ONT
-
MEL
2 stops45h 24m
Multiple Airlines
Sat 8/228:50 pm
MEL
-
ONT
2 stops41h 38m
Multiple Airlines
Deal found 3/27$1,217
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/78:00 am
ONT
-
MEL
2 stops35h 05m
Multiple Airlines
Sat 9/124:00 pm
MEL
-
ONT
2 stops22h 28m
Multiple Airlines
Deal found 3/27$1,219

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 March 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$959
(SmartFares)

One-way from

$559
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$935
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. 8% potential increase in price ($91 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 27, 2026.
Use the filters below to find and compare flights from Ontario to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 4/26

6:49 pm-6:55 am

1 stop19h 06m

Sydney Kingsford Smith

Sun 5/10

10:20 am-9:41 am

1 stop16h 21m

$1,045

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 5/18

6:59 pm-6:55 am

1 stop18h 56m

Sydney Kingsford Smith

Wed 5/27

10:20 am-5:56 pm

1 stop24h 36m

$1,048

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 5/31

1:50 pm-6:55 am

1 stop24h 05m

Sydney Kingsford Smith

Fri 6/12

10:20 am-12:12 pm

1 stop18h 52m

$1,098

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 6/3

1:50 pm-6:55 am

1 stop24h 05m

Sydney Kingsford Smith

Wed 6/10

10:20 am-12:12 pm

1 stop18h 52m

$1,147

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 9/11

8:00 am-6:50 pm

1 stop17h 50m

Sydney Kingsford Smith

Sun 9/20

8:45 pm-9:28 pm

1 stop17h 43m

$1,168

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 5/2

1:40 pm-6:55 am

2 stops48h 15m

Sydney Kingsford Smith

Tue 5/19

10:20 am-5:52 pm

1 stop24h 32m

$1,168

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Thu 9/10

8:00 am-11:35 pm

2 stops22h 35m

Melbourne

Sat 9/12

4:00 pm-9:28 pm

2 stops22h 28m

$1,219

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Fri 8/28

8:00 am-11:35 pm

2 stops22h 35m

Melbourne

Fri 9/11

5:25 pm-9:28 pm

2 stops21h 03m

$1,220

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 8/31

8:00 am-11:35 pm

2 stops22h 35m

Melbourne

Thu 9/10

5:25 pm-9:28 pm

2 stops21h 03m

$1,220

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 5/16

5:00 am-6:55 am

2 stops32h 55m

Sydney Kingsford Smith

Fri 6/19

10:20 am-12:12 pm

1 stop18h 52m

$1,252

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/22

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $376). 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.

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 $1,039, United Airlines can have you in Australia from Ontario in 19h 06m. 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 - Sydney Kingsford Smith or Ontario - Brisbane, Ontario - Melbourne 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 $376). 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

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