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$570+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
May 11 — May 181
Mon 5/11
Mon 5/18
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 April 11, 2026.

This SmartFares deal was found by Cheapflights users on 4/9. 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.
Sun 5/319:40 am
ONT
-
SYD
1 stop40h 10m
Multiple Airlines
Tue 6/98:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 4/9$1,057
This SmartFares deal was found by Cheapflights users on 4/8. 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.
Thu 7/239:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Tue 7/288:45 pm
SYD
-
ONT
1 stop18h 00m
Multiple Airlines
Deal found 4/8$1,061
This Alaska Airlines deal was found by Cheapflights users on 4/8. 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.
Tue 7/219:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Tue 8/48:45 pm
SYD
-
ONT
1 stop18h 00m
Multiple Airlines
Deal found 4/8$1,071
This Cheapflightsfares deal was found by Cheapflights users on 4/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/179:40 am
ONT
-
SYD
1 stop40h 10m
Multiple Airlines
Tue 5/268:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 4/10$1,072
This SmartFares deal was found by Cheapflights users on 4/9. 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 9/27:20 am
ONT
-
SYD
1 stop18h 30m
Multiple Airlines
Sun 9/208:45 pm
SYD
-
ONT
1 stop17h 35m
Multiple Airlines
Deal found 4/9$1,102
This SmartFares deal was found by Cheapflights users on 4/8. 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.
Thu 9/37:20 am
ONT
-
SYD
1 stop18h 30m
Multiple Airlines
Sun 9/208:45 pm
SYD
-
ONT
1 stop17h 35m
Multiple Airlines
Deal found 4/8$1,104
This SmartFares deal was found by Cheapflights users on 4/9. 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
Tue 5/268:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 4/9$1,107
This SmartFares deal was found by Cheapflights users on 4/8. 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.
Sun 8/29:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Fri 8/78:45 pm
SYD
-
ONT
1 stop18h 00m
Multiple Airlines
Deal found 4/8$1,108
This SmartFares deal was found by Cheapflights users on 4/8. 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.
Thu 7/239:11 am
ONT
-
SYD
1 stop40h 39m
Multiple Airlines
Thu 7/308:45 pm
SYD
-
ONT
1 stop18h 00m
Multiple Airlines
Deal found 4/8$1,109
This SmartFares deal was found by Cheapflights users on 4/7. 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.
Fri 10/169:00 am
ONT
-
SYD
1 stop39h 50m
Multiple Airlines
Sat 10/319:40 pm
SYD
-
ONT
1 stop17h 48m
Multiple Airlines
Deal found 4/7$1,117
This Expedia deal was found by Cheapflights users on 4/8. 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.
Sun 5/249:40 am
ONT
-
BNE
2 stops53h 20m
Multiple Airlines
Sun 5/315:05 pm
BNE
-
ONT
2 stops22h 12m
Multiple Airlines
Deal found 4/8$1,120
This Cheapflightsfares deal was found by Cheapflights users on 4/10. 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 Cheapflightsfares 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
Sun 5/248:45 pm
SYD
-
ONT
1 stop18h 32m
Multiple Airlines
Deal found 4/10$1,120

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 April 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,057
(SmartFares)

One-way from

$570
(Orient Vacations)

Popular in

December

Cheapest in

February

Average price

$926
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 ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 11, 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

Wed 8/19

7:20 am-6:50 pm

1 stop18h 30m

Sydney Kingsford Smith

Thu 9/10

8:45 pm-9:20 pm

1 stop17h 35m

$1,166

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 8/6

5:00 am-6:55 am

2 stops32h 55m

Sydney Kingsford Smith

Sun 8/23

10:20 am-12:12 pm

1 stop18h 52m

$1,203

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 5/22

6:30 pm-6:55 am

2 stops43h 25m

Sydney Kingsford Smith

Mon 6/1

10:20 am-12:12 pm

1 stop18h 52m

$1,203

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 8/20

7:20 am-11:55 am

2 stops36h 05m

Adelaide

Wed 9/9

7:10 pm-9:20 pm

2 stops42h 40m

$1,218

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Mon 8/31

7:20 am-1:40 pm

2 stops37h 20m

Brisbane

Fri 9/4

2:25 pm-9:20 pm

2 stops23h 55m

$1,219

OntarioCoolangatta

ONT - OOL

ONTOOL

Ontario

Fri 5/15

9:40 am-8:35 am

2 stops53h 55m

Coolangatta Gold Coast

Sun 5/24

7:00 am-10:17 pm

2 stops32h 17m

$1,236

OntarioCoolangatta

ONT - OOL

ONTOOL

Ontario

Fri 5/15

9:40 am-3:05 pm

2 stops60h 25m

Coolangatta Gold Coast

Thu 5/21

7:00 am-10:17 pm

2 stops32h 17m

$1,236

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 5/26

9:40 am-8:05 am

2 stops53h 55m

Adelaide

Tue 6/2

11:50 am-10:17 pm

2 stops26h 57m

$1,239

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 6/4

1:18 pm-6:55 am

2 stops24h 37m

Sydney Kingsford Smith

Thu 6/25

10:20 am-12:12 pm

1 stop18h 52m

$1,250

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

7:20 am-10:35 pm

2 stops22h 45m

Adelaide

Thu 10/15

2:25 pm-9:28 pm

2 stops24h 33m

$1,294

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/6

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 September is currently the most expensive (average of $708). 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 $1,379, United Airlines can have you in Australia from Ontario in 20h 26m. There are 7966 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 $376). Flying from Ontario to Australia in September is currently the most expensive (average of $708). 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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