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$464+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap 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 December 4, 2025.

This United Airlines deal was found by Cheapflights users on 12/3. 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 12/76:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Sun 12/2112:10 pmSYD - ONT
1 stop16h 51mUnited Airlines
Deal found 12/3$955
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/36:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Wed 12/1012:10 pmSYD - ONT
1 stop19h 07mUnited Airlines
Deal found 12/2$965
This United Airlines deal was found by Cheapflights users on 12/3. 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.
Thu 12/46:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Wed 12/1012:10 pmSYD - ONT
1 stop19h 07mUnited Airlines
Deal found 12/3$971
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/31:50 pmONT - SYD
1 stop21h 30mUnited Airlines
Thu 12/1112:10 pmSYD - ONT
1 stop19h 08mUnited Airlines
Deal found 12/2$972
This United Airlines deal was found by Cheapflights users on 12/3. 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 12/86:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Fri 12/1211:50 amSYD - ONT
1 stop28h 59mUnited Airlines
Deal found 12/3$974
This United Airlines deal was found by Cheapflights users on 12/4. 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 12/101:50 pmONT - SYD
1 stop21h 30mUnited Airlines
Sat 12/2012:10 pmSYD - ONT
1 stop16h 49mUnited Airlines
Deal found 12/4$975
This United Airlines deal was found by Cheapflights users on 12/3. 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.
Thu 12/46:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Thu 12/1112:10 pmSYD - ONT
1 stop19h 08mUnited Airlines
Deal found 12/3$977
This United Airlines deal was found by Cheapflights users on 12/4. 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 12/56:41 pmONT - SYD
1 stop19h 34mUnited Airlines
Thu 12/1112:10 pmSYD - ONT
1 stop19h 08mUnited Airlines
Deal found 12/4$978

Find 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 December 4, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$955
(United Airlines)

One-way from

$464
(United Airlines)

Popular in

December

Cheapest in

June

Average price

$1,690
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. 10% potential increase in price ($144 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 4, 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

Sun 3/8

6:37 pm-6:20 am

1 stop17h 43m

Sydney Kingsford Smith

Sun 3/15

12:10 pm-12:18 pm

1 stop18h 08m

$964

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 2/11

5:05 am-9:15 am

2 stops33h 10m

Sydney Kingsford Smith

Wed 2/25

11:50 am-8:50 pm

2 stops28h 00m

$969

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 3/28

1:40 pm-7:55 am

1 stop24h 15m

Sydney Kingsford Smith

Sun 4/5

10:20 am-9:55 am

1 stop16h 35m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 2/14

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Sun 2/22

11:50 am-9:59 pm

1 stop29h 09m

$971

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 4/22

6:53 pm-6:55 am

1 stop19h 02m

Sydney Kingsford Smith

Fri 5/1

10:20 am-12:20 pm

1 stop19h 00m

$972

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 2/23

6:37 pm-9:15 am

1 stop19h 38m

Sydney Kingsford Smith

Sun 3/8

12:10 pm-11:18 am

1 stop18h 08m

$972

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 4/21

6:53 pm-6:55 am

1 stop19h 02m

Sydney Kingsford Smith

Sun 5/3

10:20 am-12:20 pm

1 stop19h 00m

$972

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 5/15

6:53 pm-6:55 am

1 stop19h 02m

Sydney Kingsford Smith

Mon 5/25

10:20 am-5:47 pm

1 stop24h 27m

$975

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 5/3

1:33 pm-6:55 am

1 stop24h 22m

Sydney Kingsford Smith

Fri 5/15

10:20 am-12:20 pm

1 stop19h 00m

$975

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 2/12

6:00 am-7:00 am

1 stop30h 00m

Sydney Kingsford Smith

Sat 2/21

11:50 am-9:59 pm

1 stop29h 09m

$977

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 21 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 December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Sydney flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $495). Flying from Ontario to Sydney in December is currently the most expensive (average of $804). 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 December 4, 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 December 4, 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
9,066 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

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
9,066 reviews
United Airlines
7.4
Good
9,066 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

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 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 17h 43m. 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 24% 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 $495). Flying from Ontario to Sydney in December is currently the most expensive (average of $804). 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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,210FlexibilityNo cancel feeOn-time69%

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