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$747+ Cheap flights from Ontario (ONT) to Adelaide (ADL)

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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Ontario to Adelaide

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Adelaide (ADL). 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 September 17, 2025.

Round-trip from

$1,333
(United Airlines)

One-way from

$747
(United Airlines)

Popular in

December

Cheapest in

July

Average price

$1,216
From Ontario to Adelaide
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One-way flight from Ontario to Adelaide
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Highest demand for flights based on searches. 13% potential increase in price ($195 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Adelaide

Cheapest flights from Ontario to Adelaide
Explore the most affordable flight options available from Ontario to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sun 12/145:05 amONT - ADL
2 stops57h 55mUnited Airlines
Wed 12/312:55 pmADL - ONT
1 stop26h 08mUnited Airlines
Deal found 9/17$1,627
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/156:36 pmONT - ADL
2 stops24h 04mUnited Airlines
Fri 11/217:15 amADL - ONT
2 stops23h 52mUnited Airlines
Deal found 9/16$2,171
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 12/166:41 pmONT - ADL
2 stops24h 59mUnited Airlines
Tue 1/67:15 amADL - ONT
2 stops23h 29mUnited Airlines
Deal found 9/16$2,637
This oojo deal was found by Cheapflights users on 9/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:00 amONT - ADL
2 stops41h 20mQatar Airways
Fri 11/2112:35 pmADL - ONT
3 stops53h 54mQatar Airways
Deal found 9/16$2,765
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:54 amONT - ADL
2 stops36h 26mQatar Airways
Wed 11/1910:00 pmADL - ONT
2 stops44h 02mQatar Airways
Deal found 9/15$2,844
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 12/151:50 pmONT - ADL
1 stop25h 10mUnited Airlines
Wed 12/312:55 pmADL - ONT
1 stop26h 08mUnited Airlines
Deal found 9/15$6,905
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Mon 9/226:50 pmONT - ADL
2 stops23h 35mUnited Airlines
Mon 10/136:10 amADL - ONT
2 stops23h 33mUnited Airlines
Deal found 9/17$7,617
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 12/151:50 pmONT - ADL
1 stop25h 10mUnited Airlines
Sat 1/32:55 pmADL - ONT
1 stop21h 18mUnited Airlines
Deal found 9/15$8,522
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 12/1810:42 amONT - ADL
1 stop28h 18mUnited Airlines
Mon 1/52:55 pmADL - ONT
1 stop21h 18mUnited Airlines
Deal found 9/15$8,845
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/141:53 pmONT - ADL
2 stops28h 52mUnited Airlines
Tue 10/217:40 amADL - ONT
2 stops22h 03mUnited Airlines
Deal found 9/14$9,844

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Adelaide 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 September 17, 2025.
Use the filters below to find and compare flights from Ontario to Adelaide that are best for you.

Fly from

Ontario

Fly to

Adelaide

Route

Depart

Return

Price

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 1/1

6:39 pm-9:30 am

1 stop20h 21m

Adelaide

Wed 1/28

2:55 pm-5:43 pm

1 stop21h 18m

$1,333

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 1/1

6:39 pm-9:30 am

1 stop20h 21m

Adelaide

Sat 1/31

2:55 pm-5:43 pm

1 stop21h 18m

$1,384

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 1/2

1:40 pm-9:30 am

2 stops49h 20m

Adelaide

Sat 1/31

2:55 pm-8:58 pm

2 stops24h 33m

$1,562

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 12/14

5:05 am-9:30 am

2 stops57h 55m

Adelaide

Wed 12/31

2:55 pm-9:07 pm

2 stops24h 42m

$1,627

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 10/15

6:36 pm-12:10 pm

2 stops24h 04m

Adelaide

Fri 11/21

7:15 am-12:37 pm

2 stops23h 52m

$2,171

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 12/16

6:41 pm-2:10 pm

2 stops24h 59m

Adelaide

Tue 1/6

7:15 am-12:14 pm

2 stops23h 29m

$2,637

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 10/15

6:00 am-4:50 pm

2 stops41h 20m

Adelaide

Fri 11/21

12:35 pm-11:59 pm

3 stops53h 54m

$2,765

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 12/15

1:50 pm-9:30 am

1 stop25h 10m

Adelaide

Wed 12/31

2:55 pm-10:33 pm

1 stop26h 08m

$6,905

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 2/16

5:40 am-9:30 am

2 stops33h 20m

$747

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 1/10

5:05 am-9:30 am

2 stops33h 55m

$812

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 15 results
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Best time to book a flight from Ontario to Adelaide

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

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $1,214). Flying from Ontario to Adelaide in December is currently the most expensive (average of $2,057). 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.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Adelaide. 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 Adelaide?

    A quick flight from Ontario to Adelaide can take about 20h 21m. United Airlines provides one of the quickest options available for as low as $1,333. The distance from Ontario to Adelaide is about 8211 mi.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $1,214). Flying from Ontario to Adelaide in December is currently the most expensive (average of $2,057). 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 Adelaide?

Book flights to Adelaide if you plan to visit one of these locations
Glenelg

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