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$681+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Jun 19 — Jun 261
Fri 6/19
Fri 6/26
1 adult, Economy
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Find cheap flights from Ontario to Adelaide with Cheapflights

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Cheap 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 May 20, 2026.

This Alaska Airlines deal was found by Cheapflights users on 5/19. 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.
Sun 8/99:11 am
ONT
-
ADL
2 stops62h 44m
Multiple Airlines
Wed 8/127:10 pm
ADL
-
ONT
2 stops43h 05m
Multiple Airlines
Deal found 5/19$1,241
This United Airlines deal was found by Cheapflights users on 5/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/166:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Tue 6/236:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/18$1,291
This United Airlines deal was found by Cheapflights users on 5/16. 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.
Sun 5/176:59 pm
ONT
-
ADL
2 stops23h 26m
United Airlines
Sun 5/246:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/16$1,298
This United Airlines deal was found by Cheapflights users on 5/17. 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 7/56:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Thu 7/166:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/17$1,341
This KAYAK deal was found by Cheapflights users on 5/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/106:00 am
ONT
-
ADL
2 stops39h 05m
Multiple Airlines
Fri 7/246:40 am
ADL
-
ONT
2 stops22h 02m
Multiple Airlines
Deal found 5/19$1,402
This United Airlines deal was found by Cheapflights users on 5/20. 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 7/136:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Tue 8/116:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/20$1,589
This United Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 10/56:32 pm
ONT
-
ADL
2 stops25h 43m
United Airlines
Mon 10/197:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 5/16$1,591
This Qatar Airways deal was found by Cheapflights users on 5/17. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2110:25 am
ONT
-
ADL
2 stops36h 55m
Qatar Airways
Wed 9/309:40 pm
ADL
-
ONT
2 stops37h 47m
Qatar Airways
Deal found 5/17$1,718
This United Airlines deal was found by Cheapflights users on 5/19. 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 7/111:50 pm
ONT
-
ADL
2 stops28h 35m
United Airlines
Mon 8/36:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 5/19$1,720
This Qatar Airways deal was found by Cheapflights users on 5/17. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1810:25 am
ONT
-
ADL
2 stops36h 55m
Qatar Airways
Thu 10/19:40 pm
ADL
-
ONT
2 stops39h 58m
Qatar Airways
Deal found 5/17$1,758
This United Airlines deal was found by Cheapflights users on 5/20. 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 7/126:39 pm
ONT
-
ADL
2 stops26h 36m
United Airlines
Sun 8/26:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/20$1,765

Find 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 May 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,241
(Alaska Airlines)

One-way from

$681
(United Airlines)

Popular in

January

Cheapest in

October

Average price

$1,224
Provider with most accurate pricing for Ontario-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Adelaide flights.
Search Deals
From Ontario to Adelaide
Search Deals
One-way flight from Ontario to Adelaide
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($132 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 20, 2026.
Use the filters below to find and compare flights from Ontario to Adelaide that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 8/9

9:11 am-4:25 pm

2 stops62h 44m

Adelaide

Wed 8/12

7:10 pm-9:45 pm

2 stops43h 05m

$1,241

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 8/18

9:11 am-7:05 pm

2 stops65h 24m

Adelaide

Wed 8/26

7:10 pm-9:20 pm

2 stops42h 40m

$1,243
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 6/16

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Tue 6/23

6:05 am-12:12 pm

2 stops22h 37m

$1,291

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 7/10

6:00 am-1:35 pm

2 stops39h 05m

Adelaide

Fri 7/24

6:40 am-12:12 pm

2 stops22h 02m

$1,402

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 7/13

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Tue 8/11

6:05 am-12:12 pm

2 stops22h 37m

$1,589

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 7/11

1:50 pm-10:55 am

2 stops28h 35m

Adelaide

Mon 8/3

6:40 am-12:12 pm

2 stops22h 02m

$1,720

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 9/19

7:20 am-3:50 pm

2 stops40h 00m

Adelaide

Tue 9/29

9:40 pm-9:08 pm

2 stops39h 58m

$1,758

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 9/18

10:25 am-3:50 pm

2 stops36h 55m

Adelaide

Thu 10/1

9:40 pm-9:08 pm

2 stops39h 58m

$1,758

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 7/12

6:39 pm-1:45 pm

2 stops26h 36m

Adelaide

Sun 8/2

6:05 am-12:12 pm

2 stops22h 37m

$1,765

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 9/18

10:25 am-3:50 pm

2 stops36h 55m

Adelaide

Sat 9/26

9:40 pm-6:57 pm

2 stops37h 47m

$1,798

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/18

Showing 1-10 of 18 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on Ontario-Adelaide flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Adelaide flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Adelaide flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Adelaide flights, Cheapflights users trust FlightHub the most. FlightHub 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-Adelaide 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 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.

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 23h 56m. United Airlines provides one of the quickest options available for as low as $1,291. 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.

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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