HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$427+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Sydney with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 July 3, 2025.

Round-trip from

$845
(American Airlines)

One-way from

$427
(American Airlines)

Popular in

October

Cheapest in

April

Average price

$1,233
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. 7% potential increase in price ($88 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 July 3, 2025.

This American Airlines deal was found by Cheapflights users on 7/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/126:10 amONT - SYD
1 stop31h 45mAmerican Airlines
Wed 8/2712:10 pmSYD - ONT
1 stop20h 56mAmerican Airlines
Deal found 7/3$842
This United Airlines deal was found by Cheapflights users on 7/1. 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 12/96:42 pmONT - SYD
1 stop19h 33mUnited Airlines
Thu 1/2212:10 pmSYD - ONT
1 stop16h 49mUnited Airlines
Deal found 7/1$870
This Alaska Airlines deal was found by Cheapflights users on 7/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/89:00 amONT - SYD
1 stop17h 45mAlaska Airlines
Fri 12/129:40 pmSYD - ONT
1 stop19h 15mAlaska Airlines
Deal found 7/3$1,060

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 July 3, 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

Tue 8/12

6:10 am-6:55 am

1 stop31h 45m

Sydney Kingsford Smith

Wed 8/27

12:10 pm-4:06 pm

1 stop20h 56m

$842

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 12/9

6:42 pm-9:15 am

1 stop19h 33m

Sydney Kingsford Smith

Thu 12/25

12:10 pm-9:59 am

1 stop16h 49m

$870

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 8/8

9:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Fri 12/12

9:40 pm-9:55 pm

1 stop19h 15m

$1,060

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 8/15

12:22 pm-6:55 am

2 stops25h 33m

$427

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 9/8

6:50 pm-6:55 am

1 stop19h 05m

$613

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 10/23

11:07 am-7:45 pm

1 stop38h 38m

$626

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 8/8

9:00 am-7:45 pm

1 stop17h 45m

$632

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 11/3

6:45 am-1:15 pm

3 stops35h 30m

$728

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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 $1,040). Flying from Ontario to Sydney in December is currently the most expensive (average of $1,630). 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 July 3, 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 July 3, 2025.
Read through reviews of airlines operating flights from Ontario to Sydney, such as China Airlines, Alaska Airlines, and Hawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
China Airlines
8.3
Very good
744 reviews
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Alaska Airlines
8.0
Very good
10,000 reviews
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Hawaiian Airlines
7.8
Good
2,545 reviews
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
United Airlines
7.4
Good
8,861 reviews
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
American Airlines
7.2
Good
10,000 reviews
China Airlines
8.3
Very good
744 reviews

Boarding

8.3

Crew

8.5

Overall

8.3

Entertainment

8.0

Comfort

8.0

Food

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver

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.

  • What are the cheapest airlines flying from Ontario to Sydney round-trip?

    Cheapflights users have booked flights from Ontario to Sydney round-trip from $845. Other airlines that can offer you cheap pricing are United Airlines, from $870, and Alaska Airlines, from $1,060. American Airlines is 23% 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?

    $427 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on United Airlines and Alaska Airlines, with prices starting from $613 and $631, 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, February is the cheapest month in which you can book a flight from Ontario to Sydney (average of $1,040). Flying from Ontario to Sydney in December is currently the most expensive (average of $1,630). 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 Ontario?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
San Francisco to Sydney flights
Santa Ana to Sydney flights
San Jose to Sydney flights
Oakland to Sydney flights
Burbank to Sydney flights
San Diego to Sydney flights
Sacramento to Sydney flights
Las Vegas to Sydney flights
Reno to Sydney flights
Fresno to Sydney flights
Long Beach to Sydney flights
San Francisco to Coolangatta flights
Santa Rosa to Sydney flights
Los Angeles to Coolangatta flights
Medford to Sydney flights
San Luis Obispo to Sydney flights
Ontario to Coolangatta flights
Palm Springs to Sydney flights
San Francisco to Ballina flights
San Jose to Coolangatta flights
San Francisco to Armidale flights
Monterey to Sydney flights
San Francisco to Wagga Wagga flights
San Diego to Coolangatta flights
San Francisco to Tamworth flights
San Francisco to Lord Howe Island flights
Arcata to Sydney flights
San Francisco to Port Macquarie flights
San Francisco to Coffs Harbour flights

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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,127FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.