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$459+ 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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
nov. 15 — nov. 221
sáb. 11/15
sáb. 11/22
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 octubre 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$959
(United Airlines)

One-way from

$464
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$979
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. 16% potential increase in price ($191 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in October 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 octubre 16, 2025.

This United Airlines deal was found by Cheapflights users on 10/15. 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.
dom. 10/198:16 pmONT - SYD
1 stop17h 39mUnited Airlines
dom. 11/212:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/15$957
This United Airlines deal was found by Cheapflights users on 10/16. 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.
mié. 10/226:36 pmONT - SYD
1 stop19h 19mUnited Airlines
lun. 10/2712:10 pmSYD - ONT
1 stop18h 27mUnited Airlines
Deal found 10/16$960
This United Airlines deal was found by Cheapflights users on 10/15. 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.
vie. 10/316:38 pmONT - SYD
1 stop20h 37mUnited Airlines
mar. 11/412:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/15$965
This United Airlines deal was found by Cheapflights users on 10/16. 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.
sáb. 11/16:38 pmONT - SYD
1 stop20h 37mUnited Airlines
mié. 11/512:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/16$969
This United Airlines deal was found by Cheapflights users on 10/16. 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. 12/296:39 pmONT - SYD
1 stop19h 36mUnited Airlines
mié. 2/42:00 pmSYD - ONT
1 stop22h 43mUnited Airlines
Deal found 10/16$970
This United Airlines deal was found by Cheapflights users on 10/15. 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. 10/216:36 pmONT - SYD
1 stop19h 19mUnited Airlines
mié. 11/1912:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/15$971
This United Airlines deal was found by Cheapflights users on 10/15. 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. 11/36:38 pmONT - BNE
1 stop18h 52mUnited Airlines
dom. 11/1611:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/15$1,028
This United Airlines deal was found by Cheapflights users on 10/16. 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. 11/106:38 pmONT - BNE
1 stop18h 52mUnited Airlines
lun. 11/1711:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/16$1,036
This United Airlines deal was found by Cheapflights users on 10/15. 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. 11/2511:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/15$1,037
This United Airlines deal was found by Cheapflights users on 10/16. 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.
dom. 11/308:38 pmONT - BNE
1 stop16h 52mUnited Airlines
dom. 12/711:40 amBNE - ONT
2 stops42h 52mUnited Airlines
Deal found 10/16$1,056
This United Airlines deal was found by Cheapflights users on 10/16. 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.
mié. 11/196:38 pmONT - BNE
1 stop18h 52mUnited Airlines
jue. 11/2711:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/16$1,086
This United Airlines deal was found by Cheapflights users on 10/15. 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.
jue. 11/66:38 pmONT - BNE
1 stop18h 52mUnited Airlines
dom. 11/1611:40 amBNE - ONT
1 stop23h 54mUnited Airlines
Deal found 10/15$1,087

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 octubre 16, 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

jue. 2/5

6:39 pm-9:15 am

1 stop19h 36m

Sydney Kingsford Smith

vie. 2/27

12:10 pm-12:18 pm

1 stop19h 08m

$969

OntarioSydney

ONT - SYD

ONTSYD

Ontario

lun. 2/23

6:37 pm-9:15 am

1 stop19h 38m

Sydney Kingsford Smith

lun. 3/2

12:10 pm-12:18 pm

1 stop19h 08m

$970

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mar. 3/3

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

mar. 3/10

2:00 pm-6:00 pm

1 stop22h 00m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mar. 3/10

7:15 pm-9:15 am

1 stop20h 00m

Sydney Kingsford Smith

mié. 3/18

12:10 pm-12:17 pm

1 stop18h 07m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mié. 2/4

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

mié. 2/25

11:50 am-9:59 pm

1 stop29h 09m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

lun. 11/10

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

vie. 11/14

12:10 pm-12:37 pm

1 stop19h 27m

$973

OntarioSydney

ONT - SYD

ONTSYD

Ontario

vie. 11/14

6:05 am-7:00 am

1 stop29h 55m

Sydney Kingsford Smith

lun. 11/17

11:50 am-9:49 pm

1 stop28h 59m

$973

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mar. 11/18

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

vie. 11/28

12:10 pm-12:37 pm

1 stop19h 27m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

lun. 12/8

6:41 pm-9:15 am

1 stop19h 34m

Sydney Kingsford Smith

vie. 12/12

11:50 am-9:49 pm

1 stop28h 59m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

lun. 10/27

6:38 pm-9:15 am

1 stop20h 37m

Sydney Kingsford Smith

jue. 11/13

12:10 pm-12:37 pm

1 stop19h 27m

$974

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

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 September is currently the most expensive (average of $740). 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 octubre 16, 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 octubre 16, 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
8,982 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

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
8,982 reviews
United Airlines
7.4
Good
8,982 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

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 $969, United Airlines can have you in Australia from Ontario in 19h 36m. There are 7534 mi between Ontario and Australia. This flight may include one or multiple stops.

  • 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 $459. American Airlines flights start at $597 while deals on Philippine Airlines start at $942 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, 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 September is currently the most expensive (average of $740). 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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Alternative routes for Ontario to Australia

See prices for flight routes from nearby airports that may be better suited for you.
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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 octubre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

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