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$457+ 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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
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 agosto 14, 2025.

Round-trip from

$938
(American Airlines)

One-way from

$457
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$923
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 ($152 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. 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.
dom. 9/281:10 pmONT - SYD
2 stops24h 55mAmerican Airlines
dom. 10/510:10 amSYD - ONT
2 stops29h 37mAmerican Airlines
Deal found 8/14$938
This lol.travel deal was found by Cheapflights users on 8/12. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/176:39 pmONT - SYD
1 stop19h 16mUnited Airlines
dom. 8/3110:20 amSYD - ONT
1 stop18h 53mUnited Airlines
Deal found 8/12$1,007
This lol.travel deal was found by Cheapflights users on 8/13. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/106:50 pmONT - SYD
1 stop19h 05mUnited Airlines
mié. 9/1710:20 amSYD - ONT
1 stop18h 53mUnited Airlines
Deal found 8/13$1,009
This lol.travel deal was found by Cheapflights users on 8/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/176:39 pmONT - BNE
1 stop18h 51mUnited Airlines
dom. 8/3110:30 amBNE - ONT
1 stop18h 43mUnited Airlines
Deal found 8/14$1,022
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/18:35 amONT - SYD
1 stop18h 10mMultiple Airlines
vie. 9/54:20 pmSYD - ONT
1 stop21h 50mMultiple Airlines
Deal found 8/14$1,040
This American Airlines deal was found by Cheapflights users on 8/13. 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.
dom. 8/172:31 pmONT - MEL
1 stop21h 29mAmerican Airlines
dom. 8/313:05 pmMEL - ONT
1 stop20h 20mAmerican Airlines
Deal found 8/13$1,054
This American Airlines deal was found by Cheapflights users on 8/14. 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.
lun. 9/112:47 pmONT - MEL
1 stop23h 13mAmerican Airlines
dom. 9/213:05 pmMEL - ONT
1 stop24h 11mAmerican Airlines
Deal found 8/14$1,062
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mar. 11/116:38 pmONT - BNE
1 stop18h 52mUnited Airlines
mar. 11/1811:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 8/12$1,065
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mar. 11/117:00 amONT - BNE
2 stops30h 30mUnited Airlines
dom. 11/2311:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 8/12$1,069
This Alaska Airlines deal was found by Cheapflights users on 8/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/119:45 amONT - SYD
1 stop39h 00mAlaska Airlines
sáb. 12/69:40 pmSYD - ONT
1 stop19h 15mAlaska Airlines
Deal found 8/11$1,076
This United Airlines deal was found by Cheapflights users on 8/14. 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.
lun. 10/206:36 pmONT - SYD
1 stop19h 19mUnited Airlines
dom. 11/211:50 amSYD - ONT
1 stop28h 47mUnited Airlines
Deal found 8/14$1,078
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/176:39 pmONT - MEL
1 stop20h 36mUnited Airlines
dom. 8/3110:55 amMEL - ONT
1 stop18h 18mUnited Airlines
Deal found 8/14$1,081

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 agosto 14, 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

dom. 9/28

1:10 pm-7:05 am

2 stops24h 55m

Sydney Kingsford Smith

dom. 10/5

10:10 am-9:47 pm

2 stops29h 37m

$938

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mié. 9/10

6:50 pm-6:55 am

1 stop19h 05m

Sydney Kingsford Smith

mié. 9/17

10:20 am-12:13 pm

1 stop18h 53m

$1,009

OntarioSydney

ONT - SYD

ONTSYD

Ontario

lun. 9/1

8:35 am-7:45 pm

1 stop18h 10m

Sydney Kingsford Smith

vie. 9/5

4:20 pm-9:10 pm

1 stop21h 50m

$1,040

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

lun. 9/1

12:47 pm-5:00 am

1 stop23h 13m

Melbourne

dom. 9/21

3:05 pm-10:16 pm

1 stop24h 11m

$1,062

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

vie. 11/14

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

vie. 11/21

11:40 am-5:34 pm

1 stop23h 54m

$1,065

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

mar. 11/11

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

jue. 11/20

11:40 am-12:37 pm

1 stop18h 57m

$1,065

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

mié. 11/12

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

lun. 11/24

11:40 am-12:37 pm

1 stop18h 57m

$1,065

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

dom. 11/16

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

lun. 11/24

11:40 am-12:37 pm

1 stop18h 57m

$1,065

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

vie. 11/14

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

sáb. 11/22

11:40 am-5:34 pm

1 stop23h 54m

$1,065

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

mar. 11/4

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

jue. 11/13

11:40 am-5:34 pm

1 stop23h 54m

$1,065

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

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, February is the cheapest month in which you can book a flight from Ontario to Australia (average of $1,031). Flying from Ontario to Australia in December is currently the most expensive (average of $1,619). 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 agosto 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Australia as you normally would.

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 agosto 14, 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
8,916 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

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
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

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.

  • What are the cheapest airlines to fly from Ontario to Australia one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $554. American Airlines flights start at $690 while deals on Hawaiian Airlines start at $702 one-way.

  • 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, February is the cheapest month in which you can book a flight from Ontario to Australia (average of $1,031). Flying from Ontario to Australia in December is currently the most expensive (average of $1,619). 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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

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