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$451+ Cheap flights from Ontario (ONT) to Australia

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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Ontario to Australia

Keep the following information in mind while searching for Ontario to Australia flight deals. Data was last updated June 12, 2025.

Round-trip from

$931
(Tripair)

One-way from

$464
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$954
From Ontario to Australia
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One-way flight from Ontario to Australia
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Highest demand for flights based on searches. 13% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Ontario to Australia

Cheapest flights from Ontario to Australia
Explore the most affordable flight options available from Ontario to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Tripair deal was found by Cheapflights users on 6/12. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/26:31 pmONT - SYD
2 stops43h 24mUnited Airlines
Fri 8/1510:20 amSYD - ONT
1 stop18h 54mUnited Airlines
Deal found 6/12$931
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sun 6/158:15 amONT - SYD
1 stop29h 40mAmerican Airlines
Fri 7/1810:25 amSYD - ONT
1 stop28h 45mAmerican Airlines
Deal found 6/11$939
This Delta deal was found by Cheapflights users on 6/10. 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.
Sun 6/156:00 amONT - SYD
2 stops31h 35mDelta
Fri 7/189:25 amSYD - ONT
2 stops24h 04mDelta
Deal found 6/10$940
This United Airlines deal was found by Cheapflights users on 6/12. 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 11/11:40 pmONT - BNE
1 stop23h 50mUnited Airlines
Sat 11/811:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 6/12$1,065
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 12/29:50 amONT - SYD
1 stop38h 55mAlaska Airlines
Sat 3/79:40 pmSYD - ONT
1 stop19h 15mAlaska Airlines
Deal found 6/10$1,076
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/76:25 amONT - PER
3 stops34h 10mMultiple Airlines
Thu 8/219:55 pmPER - ONT
3 stops34h 45mMultiple Airlines
Deal found 6/12$1,208
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/46:39 pmONT - MEL
1 stop20h 36mUnited Airlines
Sun 8/1710:55 amMEL - ONT
1 stop18h 19mUnited Airlines
Deal found 6/10$1,301
This United Airlines deal was found by Cheapflights users on 6/12. 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 8/206:50 pmONT - ADL
2 stops23h 45mUnited Airlines
Wed 8/276:05 amADL - ONT
2 stops22h 38mUnited Airlines
Deal found 6/12$1,367
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1112:45 amONT - MEL
2 stops28h 50mMultiple Airlines
Thu 8/2112:30 amMEL - ONT
2 stops34h 10mMultiple Airlines
Deal found 6/10$1,371
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/261:19 pmONT - OOL
2 stops28h 21mUnited Airlines
Sat 8/26:00 amOOL - ONT
2 stops28h 58mUnited Airlines
Deal found 6/11$1,501
This Fiji Airways deal was found by Cheapflights users on 6/11. 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/73:00 pmONT - BNE
2 stops26h 25mMultiple Airlines
Sat 10/1811:40 amBNE - ONT
2 stops27h 20mMultiple Airlines
Deal found 6/11$1,534
This United Airlines deal was found by Cheapflights users on 6/10. 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 6/246:41 pmONT - CNS
2 stops32h 04mUnited Airlines
Tue 7/16:00 amCNS - ONT
2 stops23h 14mUnited Airlines
Deal found 6/10$1,572

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Australia 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 June 12, 2025.
Use the filters below to find and compare flights from Ontario to Australia that are best for you.

Fly from

Ontario

Fly to

Australia

Route

Depart

Return

Price

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 8/2

6:31 pm-6:55 am

2 stops43h 24m

Sydney Kingsford Smith

Fri 8/15

10:20 am-12:14 pm

1 stop18h 54m

$931

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 7/26

1:15 pm-6:35 am

2 stops24h 20m

Sydney Kingsford Smith

Sat 8/2

9:25 am-11:17 pm

2 stops30h 52m

$1,003

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sat 11/1

1:40 pm-6:30 am

1 stop23h 50m

Brisbane

Sat 11/8

11:40 am-12:37 pm

1 stop18h 57m

$1,065

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 12/2

9:50 am-7:45 pm

1 stop38h 55m

Sydney Kingsford Smith

Tue 3/3

9:40 pm-9:55 pm

1 stop19h 15m

$1,076

OntarioPerth

ONT - PER

ONTPER

Ontario

Thu 8/7

6:25 am-7:35 am

3 stops34h 10m

Perth

Thu 8/21

9:55 pm-5:40 pm

3 stops34h 45m

$1,208

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 8/4

6:39 pm-8:15 am

1 stop20h 36m

Melbourne

Sun 8/17

10:55 am-12:14 pm

1 stop18h 19m

$1,301

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 12/7

10:57 am-6:10 am

2 stops24h 13m

Sydney Kingsford Smith

Mon 12/15

2:20 pm-5:53 pm

2 stops22h 33m

$1,332

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 8/20

6:50 pm-11:05 am

2 stops23h 45m

Adelaide

Wed 8/27

6:05 am-12:13 pm

2 stops22h 38m

$1,367

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 8/11

12:45 am-10:35 pm

2 stops28h 50m

Melbourne

Thu 8/21

12:30 am-5:40 pm

2 stops34h 10m

$1,371

OntarioCoolangatta

ONT - OOL

ONTOOL

Ontario

Sat 7/26

1:19 pm-10:40 am

2 stops28h 21m

Coolangatta Gold Coast

Sat 8/2

6:00 am-5:58 pm

2 stops28h 58m

$1,501

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 53 results
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Best time to book a flight from Ontario to Australia

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

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

Currently, March is the cheapest month in which you can book a flight from Ontario to Australia (average of $1,041). Flying from Ontario to Australia in December is currently the most expensive (average of $1,635). 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 AU?

Find hourly flight availability from Ontario to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Australia as you normally would.

Rainfall in Australia by month

Plan your trip to Australia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Australia ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Australia when rainfall is around 2.0 in.

Temperature in Australia by month

Plan your trip to Australia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Australia, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated June 12, 2025.
Read through reviews of airlines operating flights from Ontario to Australia, such as Japan Airlines, China Airlines and Asiana Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Japan Airlines
8.3
Very good
1,489 reviews
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
China Airlines
8.3
Very good
738 reviews
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Asiana Airlines
8.2
Very good
440 reviews
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Alaska Airlines
8.0
Very good
10,000 reviews
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.
Delta
8.0
Very good
7,950 reviews
Japan Airlines
8.3
Very good
1,489 reviews

Food

7.7

Boarding

8.4

Comfort

8.2

Overall

8.3

Entertainment

7.8

Crew

8.7

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

DFW - NRT

This flight was operated by American Airlines. The food was barely tolerable. Mid flight sandwich was ice cold, could not be bothered to warm it up. Staff did not seem to like their jobs very much. Too many seats packed in to maximize profit. A true “cattle car” experience. Subsequent flight from Tokyo to HCMC was on Japan Airlines which was excellent. No comparison between JAL and AA. Unfortunately that’s just the way service is in America nowadays.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Australia?

    If you book a flight to Australia from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

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

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $464. American Airlines flights start at $504 while deals on Hawaiian Airlines start at $611 one-way.

  • What are the most popular routes from Ontario to Australia?

    While some choose either Ontario - Melbourne or Ontario - Brisbane, Ontario - Sydney Kingsford Smith is the most popular route from Ontario to Australia.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Ontario to Australia (average of $1,041). Flying from Ontario to Australia in December is currently the most expensive (average of $1,635). 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.

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Top airline flying from Ontario to Australia

Discover the top airline that operate flights from Ontario to Australia. 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,127FlexibilityNo cancel feeOn-time69%

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