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$459+ 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 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
Sat 11/15
Sat 11/22
1 adult, Economy
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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 October 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.
Sun 10/198:16 pmONT - SYD
1 stop17h 39mUnited Airlines
Sun 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.
Wed 10/226:36 pmONT - SYD
1 stop19h 19mUnited Airlines
Mon 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.
Fri 10/316:38 pmONT - SYD
1 stop20h 37mUnited Airlines
Tue 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.
Sat 11/16:38 pmONT - SYD
1 stop20h 37mUnited Airlines
Wed 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.
Mon 12/296:39 pmONT - SYD
1 stop19h 36mUnited Airlines
Wed 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.
Tue 10/216:36 pmONT - SYD
1 stop19h 19mUnited Airlines
Wed 11/1912:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/15$971

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 October 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

July

Cheapest in

September

Average price

$1,238
Provider with most accurate pricing for Ontario-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Sydney Kingsford Smith flights.
Search Deals
From Ontario to Sydney Kingsford Smith
Search Deals
One-way flight from Ontario to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 16, 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

Thu 2/5

6:39 pm-9:15 am

1 stop19h 36m

Sydney Kingsford Smith

Fri 2/27

12:10 pm-12:18 pm

1 stop19h 08m

$969

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 2/23

6:37 pm-9:15 am

1 stop19h 38m

Sydney Kingsford Smith

Mon 3/2

12:10 pm-12:18 pm

1 stop19h 08m

$970

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 3/3

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Tue 3/10

2:00 pm-6:00 pm

1 stop22h 00m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 3/10

7:15 pm-9:15 am

1 stop20h 00m

Sydney Kingsford Smith

Wed 3/18

12:10 pm-12:17 pm

1 stop18h 07m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 2/4

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Wed 2/25

11:50 am-9:59 pm

1 stop29h 09m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 11/10

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

Fri 11/14

12:10 pm-12:37 pm

1 stop19h 27m

$973

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 11/14

6:05 am-7:00 am

1 stop29h 55m

Sydney Kingsford Smith

Mon 11/17

11:50 am-9:49 pm

1 stop28h 59m

$973

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 11/18

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

Fri 11/28

12:10 pm-12:37 pm

1 stop19h 27m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 12/8

6:41 pm-9:15 am

1 stop19h 34m

Sydney Kingsford Smith

Fri 12/12

11:50 am-9:49 pm

1 stop28h 59m

$974

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 10/27

6:38 pm-9:15 am

1 stop20h 37m

Sydney Kingsford Smith

Thu 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 22 results
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Compare providers for flights from Ontario to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Sydney in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, January is the cheapest month in which you can book a flight from Ontario to Sydney (average of $531). Flying from Ontario to Sydney in December is currently the most expensive (average of $861). 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 October 16, 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 25% on airfare.

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 October 16, 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
8,982 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

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

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

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 United Airlines fly from Ontario to Sydney in about 19h 36m. 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 22% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Sydney (average of $531). Flying from Ontario to Sydney in December is currently the most expensive (average of $861). 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 October 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

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