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$450+ 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 3/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Mar 28 — Apr 41
Sat 3/28
Sat 4/4
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 February 26, 2026.

This United Airlines deal was found by Cheapflights users on 2/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:37 pm
ONT
-
BNE
1 stop18h 53m
United Airlines
Fri 3/1310:40 am
BNE
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/24$846
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Mon 2/236:37 pm
ONT
-
BNE
1 stop18h 53m
United Airlines
Sun 3/810:40 am
BNE
-
ONT
1 stop29h 17m
United Airlines
Deal found 2/22$848
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Mon 2/236:37 pm
ONT
-
BNE
1 stop18h 53m
United Airlines
Fri 2/2711:40 am
BNE
-
ONT
1 stop24h 01m
United Airlines
Deal found 2/22$856
This United Airlines deal was found by Cheapflights users on 2/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:37 pm
ONT
-
BNE
1 stop18h 53m
United Airlines
Thu 3/1910:40 am
BNE
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/24$857
This United Airlines deal was found by Cheapflights users on 2/25. 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 3/141:40 pm
ONT
-
BNE
1 stop23h 50m
United Airlines
Fri 3/2710:40 am
BNE
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/25$877
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Wed 3/116:37 pm
ONT
-
BNE
1 stop18h 53m
United Airlines
Mon 3/2310:40 am
BNE
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/25$889
This Delta deal was found by Cheapflights users on 2/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:00 am
ONT
-
MEL
2 stops32h 50m
Delta
Fri 4/1710:00 am
MEL
-
ONT
2 stops30h 44m
Delta
Deal found 2/24$973
This United Airlines deal was found by Cheapflights users on 2/25. 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 2/266:37 pm
ONT
-
MEL
1 stop20h 23m
United Airlines
Wed 3/1112:00 pm
MEL
-
ONT
1 stop18h 18m
United Airlines
Deal found 2/25$993
This United Airlines deal was found by Cheapflights users on 2/26. 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.
Fri 2/276:37 pm
ONT
-
MEL
1 stop20h 23m
United Airlines
Thu 3/51:00 pm
MEL
-
ONT
1 stop18h 18m
United Airlines
Deal found 2/26$1,001
This United Airlines deal was found by Cheapflights users on 2/25. 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 2/266:37 pm
ONT
-
MEL
1 stop20h 23m
United Airlines
Thu 3/1212:00 pm
MEL
-
ONT
1 stop18h 18m
United Airlines
Deal found 2/25$1,003
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Wed 4/81:27 pm
ONT
-
MEL
1 stop25h 48m
United Airlines
Tue 4/2110:55 am
MEL
-
ONT
2 stops26h 41m
United Airlines
Deal found 2/25$1,006
This United Airlines deal was found by Cheapflights users on 2/26. 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.
Fri 3/276:37 pm
ONT
-
MEL
1 stop20h 23m
United Airlines
Sat 4/411:55 am
MEL
-
ONT
1 stop28h 50m
United Airlines
Deal found 2/26$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 February 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$856
(United Airlines)

One-way from

$450
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$864
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. 9% potential increase in price ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 26, 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

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Wed 3/11

6:37 pm-6:30 am

1 stop18h 53m

Brisbane

Wed 3/18

10:40 am-12:18 pm

1 stop18h 38m

$856

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Tue 3/10

6:37 pm-6:30 am

1 stop18h 53m

Brisbane

Tue 3/17

10:40 am-12:18 pm

1 stop18h 38m

$856

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Tue 3/10

6:37 pm-9:00 am

1 stop20h 23m

Melbourne

Wed 3/18

12:00 pm-12:18 pm

1 stop18h 18m

$1,001

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Thu 4/2

6:49 pm-9:15 am

1 stop20h 26m

Melbourne

Wed 4/29

10:55 am-8:36 pm

2 stops26h 41m

$1,005

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Wed 4/8

1:27 pm-8:15 am

1 stop25h 48m

Melbourne

Tue 4/21

10:55 am-8:36 pm

2 stops26h 41m

$1,006

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Wed 4/8

6:49 pm-8:15 am

1 stop20h 26m

Melbourne

Wed 4/22

10:55 am-12:20 pm

1 stop18h 25m

$1,013

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 4/27

6:49 pm-8:15 am

1 stop20h 26m

Melbourne

Sat 5/2

10:55 am-12:22 pm

1 stop18h 27m

$1,013

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Fri 5/1

7:03 pm-8:15 am

1 stop20h 12m

Melbourne

Mon 5/4

10:55 am-5:52 pm

1 stop23h 57m

$1,013

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 5/11

6:59 pm-8:15 am

1 stop20h 16m

Melbourne

Sun 5/17

10:55 am-12:22 pm

1 stop18h 27m

$1,013

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Wed 5/13

6:59 pm-8:15 am

1 stop20h 16m

Melbourne

Thu 5/21

10:55 am-12:12 pm

1 stop18h 17m

$1,013

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/22

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 $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.

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 $856, 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

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