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$416+ Cheap flights from Ontario (ONT) to Sydney (SYD)

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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
oct. 15 — oct. 221
mer. 10/15
mer. 10/22
1 adult, Economy
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Cheap flight deals from Ontario to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septembre 15, 2025.

Round-trip from

$1,043
(Alaska Airlines)

One-way from

$416
(Trip.com)

Popular in

July

Cheapest in

February

Average price

$1,052
From Ontario to Sydney Kingsford Smith
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One-way flight from Ontario to Sydney Kingsford Smith
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Highest demand for flights based on searches. 6% potential increase in price ($76 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Sydney

Cheapest flights from Ontario to Sydney
Explore the most affordable flight options available from Ontario to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septembre 15, 2025.

This lol.travel deal was found by Cheapflights users on 9/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/216:38 pmONT - SYD
2 stops43h 17mUnited Airlines
dim. 10/511:20 amSYD - ONT
1 stop26h 15mUnited Airlines
Deal found 9/15$1,007
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 10/306:11 pmONT - SYD
2 stops31h 34mAlaska Airlines
mar. 11/189:40 pmSYD - ONT
2 stops32h 25mAlaska Airlines
Deal found 9/13$1,043
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/296:00 amONT - SYD
2 stops43h 45mAlaska Airlines
mar. 11/189:40 pmSYD - ONT
2 stops32h 25mAlaska Airlines
Deal found 9/13$1,052
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 10/306:11 pmONT - SYD
2 stops31h 34mAlaska Airlines
jeu. 11/209:40 pmSYD - ONT
2 stops20h 52mAlaska Airlines
Deal found 9/13$1,053
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/296:00 amONT - SYD
2 stops43h 45mAlaska Airlines
jeu. 11/209:40 pmSYD - ONT
2 stops20h 52mAlaska Airlines
Deal found 9/13$1,061
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 10/314:11 pmONT - SYD
2 stops33h 34mAlaska Airlines
mar. 11/189:40 pmSYD - ONT
2 stops32h 25mAlaska Airlines
Deal found 9/13$1,062
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 11/111:59 amONT - SYD
2 stops61h 46mAlaska Airlines
ven. 11/219:40 pmSYD - ONT
2 stops31h 15mAlaska Airlines
Deal found 9/13$1,064
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/36:11 pmONT - SYD
2 stops54h 34mAlaska Airlines
mar. 11/189:40 pmSYD - ONT
2 stops32h 25mAlaska Airlines
Deal found 9/13$1,065
This lol.travel deal was found by Cheapflights users on 9/14. 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.
mar. 9/306:36 pmONT - SYD
1 stop19h 19mUnited Airlines
sam. 10/410:20 amSYD - ONT
1 stop29h 32mUnited Airlines
Deal found 9/14$1,069
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 10/3111:59 amONT - SYD
2 stops37h 46mAlaska Airlines
sam. 11/229:40 pmSYD - ONT
2 stops31h 15mAlaska Airlines
Deal found 9/13$1,072

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Sydney 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 septembre 15, 2025.
Use the filters below to find and compare flights from Ontario to Sydney that are best for you.

Fly from

Ontario

Fly to

Sydney

Route

Depart

Return

Price

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jeu. 10/30

6:11 pm-7:45 pm

2 stops31h 34m

Sydney Kingsford Smith

jeu. 11/20

9:40 pm-11:32 pm

2 stops20h 52m

$1,053

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jeu. 10/30

6:11 pm-7:45 pm

2 stops31h 34m

Sydney Kingsford Smith

sam. 11/22

9:40 pm-9:55 am

2 stops31h 15m

$1,053

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mer. 10/29

6:00 am-7:45 pm

2 stops43h 45m

Sydney Kingsford Smith

jeu. 11/20

9:40 pm-11:32 pm

2 stops20h 52m

$1,061

OntarioSydney

ONT - SYD

ONTSYD

Ontario

ven. 10/31

4:11 pm-7:45 pm

2 stops33h 34m

Sydney Kingsford Smith

mar. 11/18

9:40 pm-11:05 am

2 stops32h 25m

$1,062

OntarioSydney

ONT - SYD

ONTSYD

Ontario

dim. 11/2

5:00 am-6:45 pm

2 stops42h 45m

Sydney Kingsford Smith

mar. 11/18

9:40 pm-11:05 am

2 stops32h 25m

$1,062

OntarioSydney

ONT - SYD

ONTSYD

Ontario

dim. 11/2

5:00 am-6:45 pm

2 stops42h 45m

Sydney Kingsford Smith

sam. 11/22

9:40 pm-9:55 am

2 stops31h 15m

$1,072

OntarioSydney

ONT - SYD

ONTSYD

Ontario

ven. 10/31

11:59 am-7:45 pm

2 stops37h 46m

Sydney Kingsford Smith

jeu. 11/20

9:40 pm-11:32 pm

2 stops20h 52m

$1,072

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mer. 11/5

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

ven. 11/21

9:40 pm-8:31 pm

1 stop17h 51m

$1,077

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jeu. 3/12

9:50 am-7:45 pm

1 stop39h 55m

Sydney Kingsford Smith

jeu. 3/19

9:40 pm-9:55 pm

1 stop18h 15m

$1,077

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jeu. 2/26

9:50 am-7:45 pm

1 stop38h 55m

Sydney Kingsford Smith

mar. 3/3

9:40 pm-9:55 pm

1 stop19h 15m

$1,077

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 23 results
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Best time to book a flight from Ontario to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

What is the cheapest month to book a flight from Ontario to Sydney?

Currently, March is the cheapest month in which you can book a flight from Ontario to Sydney (average of $1,032). Flying from Ontario to Sydney in December is currently the most expensive (average of $1,627). 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 SYD?

Find hourly flight availability from Ontario to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septembre 15, 2025.

One of the essential ways to save on airfare from Ontario to Sydney is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 26% on airfare.

How much does it cost to fly round-trip from Ontario to Sydney?

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated septembre 15, 2025.
Read through reviews of airlines operating flights from Ontario to Sydney, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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 Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Sydney?

    Airlines like Alaska Airlines fly from Ontario to Sydney in about 31h 34m. The time it takes to get you to your destination can typically vary by up to . The distance between Ontario and Sydney is about 7534 mi.

  • What is the cheapest airline to fly from Ontario to Sydney round-trip?

    Cheapflights users have booked flights from Ontario to Sydney round-trip from $926. United Airlines is 20% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $620 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Hawaiian Airlines and Alaska Airlines, with prices starting from $654 and $654, respectively.

  • Can I find deals for flights from Ontario to Sydney that include hotel bookings?

    Yes. In addition to deals on Ontario to Sydney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Sydney.

  • Can I find deals for business class flights from Ontario to Sydney?

    Yes. Cheapflights offers flight deals from Ontario to Sydney 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 Sydney?

    Currently, March is the cheapest month in which you can book a flight from Ontario to Sydney (average of $1,032). Flying from Ontario to Sydney in December is currently the most expensive (average of $1,627). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

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Top airline flying from Ontario to Sydney

Discover the top airline that operate flights from Ontario to Sydney. 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 septembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

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