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$415+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
ago. 23 — ago. 301
sáb. 8/23
sáb. 8/30
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 agosto 18, 2025.

Round-trip from

$902
(Delta)

One-way from

$415
(Trip.com)

Popular in

July

Cheapest in

April

Average price

$1,146
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. 10% potential increase in price ($126 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($45 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 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 agosto 18, 2025.

This Delta deal was found by Cheapflights users on 8/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/141:15 pmONT - SYD
2 stops24h 20mDelta
dom. 9/219:25 amSYD - ONT
2 stops31h 17mDelta
Deal found 8/17$902
This American Airlines deal was found by Cheapflights users on 8/18. 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.
sáb. 11/110:57 amONT - SYD
1 stop25h 58mAmerican Airlines
sáb. 11/152:20 pmSYD - ONT
1 stop27h 09mAmerican Airlines
Deal found 8/18$935
This American Airlines deal was found by Cheapflights users on 8/17. 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.
mié. 10/11:10 pmONT - SYD
2 stops24h 55mAmerican Airlines
mié. 10/810:10 amSYD - ONT
2 stops23h 14mAmerican Airlines
Deal found 8/17$938
This American Airlines deal was found by Cheapflights users on 8/18. 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. 8/242:31 pmONT - SYD
2 stops26h 54mAmerican Airlines
dom. 9/711:00 amSYD - ONT
2 stops24h 54mAmerican Airlines
Deal found 8/18$957
This lol.travel deal was found by Cheapflights users on 8/18. 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. 8/316:50 pmONT - SYD
1 stop19h 05mUnited Airlines
dom. 9/1410:20 amSYD - ONT
1 stop18h 53mUnited Airlines
Deal found 8/18$1,014
This Trip.com deal was found by Cheapflights users on 8/17. 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.
sáb. 9/68:35 amONT - SYD
1 stop18h 10mMultiple Airlines
mié. 9/104:20 pmSYD - ONT
1 stop21h 50mMultiple Airlines
Deal found 8/17$1,041
This Trip.com deal was found by Cheapflights users on 8/18. 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.
mié. 10/110:09 amONT - SYD
1 stop40h 36mMultiple Airlines
mié. 10/225:20 pmSYD - ONT
1 stop21h 17mMultiple Airlines
Deal found 8/18$1,051
This Alaska Airlines deal was found by Cheapflights users on 8/17. 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.
vie. 8/228:35 amONT - SYD
1 stop18h 10mAlaska Airlines
mar. 12/169:40 pmSYD - ONT
1 stop18h 30mAlaska Airlines
Deal found 8/17$1,059
This United Airlines deal was found by Cheapflights users on 8/16. 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. 8/176:39 pmONT - SYD
1 stop19h 16mUnited Airlines
dom. 8/3110:20 amSYD - ONT
1 stop18h 53mUnited Airlines
Deal found 8/16$1,070
This United Airlines deal was found by Cheapflights users on 8/17. 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. 8/186:39 pmONT - SYD
1 stop19h 16mUnited Airlines
mié. 9/310:20 amSYD - ONT
1 stop18h 53mUnited Airlines
Deal found 8/17$1,073

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 agosto 18, 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

dom. 9/14

1:15 pm-6:35 am

2 stops24h 20m

Sydney Kingsford Smith

dom. 9/21

9:25 am-11:42 pm

2 stops31h 17m

$902

OntarioSydney

ONT - SYD

ONTSYD

Ontario

sáb. 11/1

1:00 pm-9:00 am

2 stops26h 00m

Sydney Kingsford Smith

sáb. 11/15

2:20 pm-6:21 pm

1 stop23h 01m

$939

OntarioSydney

ONT - SYD

ONTSYD

Ontario

dom. 8/31

6:50 pm-6:55 am

1 stop19h 05m

Sydney Kingsford Smith

dom. 9/14

10:20 am-12:13 pm

1 stop18h 53m

$1,014

OntarioSydney

ONT - SYD

ONTSYD

Ontario

dom. 11/16

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

sáb. 2/14

9:40 pm-9:55 pm

1 stop19h 15m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mar. 11/11

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

vie. 2/13

9:40 pm-9:55 pm

1 stop19h 15m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mié. 11/12

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

sáb. 2/14

9:40 pm-9:55 pm

1 stop19h 15m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jue. 10/30

9:45 am-7:45 pm

1 stop40h 00m

Sydney Kingsford Smith

jue. 11/27

9:40 pm-8:41 pm

1 stop18h 01m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jue. 11/13

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

vie. 2/13

9:40 pm-9:55 pm

1 stop19h 15m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

jue. 9/18

3:06 pm-2:40 pm

2 stops30h 34m

$415

OntarioSydney

ONT - SYD

ONTSYD

Ontario

mar. 10/21

11:07 am-3:40 pm

1 stop34h 33m

$440

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 16 results
1
2

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, February is the cheapest month in which you can book a flight from Ontario to Sydney (average of $1,031). Flying from Ontario to Sydney 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 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 agosto 18, 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.

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 agosto 18, 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
8,925 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

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
8,925 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

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 Delta, American Airlines, and United Airlines fly from Ontario to Sydney in about 19h 05m. The time it takes to get you to your destination can typically vary by up to 6h 55m. The distance between Ontario and Sydney is about 7534 mi. This flight may include one or multiple stops.

  • 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 16% 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, February is the cheapest month in which you can book a flight from Ontario to Sydney (average of $1,031). Flying from Ontario to Sydney 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Wollongong
Parramatta
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 agosto 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

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