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$645+ 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 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Aug 17 — Aug 241
Mon 8/17
Mon 8/24
1 adult, Economy
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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 July 18, 2026.

This oojo deal was found by Cheapflights users on 7/13. 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.
Thu 8/69:11 am
ONT
-
ADL
2 stops44h 54m
Multiple Airlines
Thu 8/208:00 pm
ADL
-
ONT
2 stops42h 40m
Multiple Airlines
Deal found 7/13$1,200
This Expedia deal was found by Cheapflights users on 7/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/309:31 am
ONT
-
ADL
2 stops54h 04m
Multiple Airlines
Sun 9/63:00 pm
ADL
-
ONT
2 stops23h 40m
Multiple Airlines
Deal found 7/16$1,234
This Alaska Airlines deal was found by Cheapflights users on 7/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:11 am
ONT
-
ADL
2 stops54h 24m
Multiple Airlines
Fri 8/282:25 pm
ADL
-
ONT
2 stops24h 15m
Multiple Airlines
Deal found 7/14$1,237
This United Airlines deal was found by Cheapflights users on 7/15. 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.
Sun 11/16:36 pm
ONT
-
ADL
2 stops25h 04m
United Airlines
Sun 11/156:10 am
ADL
-
ONT
2 stops24h 21m
United Airlines
Deal found 7/15$1,281
This United Airlines deal was found by Cheapflights users on 7/17. 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.
Tue 9/11:56 pm
ONT
-
ADL
2 stops28h 29m
United Airlines
Wed 9/306:00 am
ADL
-
ONT
2 stops20h 53m
United Airlines
Deal found 7/17$1,287
This United Airlines deal was found by Cheapflights users on 7/13. 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 11/144:04 pm
ONT
-
ADL
2 stops29h 46m
United Airlines
Wed 11/186:10 am
ADL
-
ONT
2 stops24h 21m
United Airlines
Deal found 7/13$1,327
This United Airlines deal was found by Cheapflights users on 7/15. 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.
Sun 11/16:36 pm
ONT
-
ADL
2 stops25h 04m
United Airlines
Sat 11/216:10 am
ADL
-
ONT
2 stops24h 21m
United Airlines
Deal found 7/15$1,331
This United Airlines deal was found by Cheapflights users on 7/17. 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.
Fri 11/136:36 pm
ONT
-
ADL
2 stops23h 54m
United Airlines
Mon 11/236:10 am
ADL
-
ONT
2 stops24h 21m
United Airlines
Deal found 7/17$1,332
This United Airlines deal was found by Cheapflights users on 7/16. 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.
Sat 8/84:20 pm
ONT
-
ADL
2 stops26h 15m
United Airlines
Mon 8/177:15 am
ADL
-
ONT
2 stops21h 27m
United Airlines
Deal found 7/16$1,334
This Qatar Airways deal was found by Cheapflights users on 7/15. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:00 am
ONT
-
ADL
2 stops40h 00m
Qatar Airways
Wed 11/1810:00 pm
ADL
-
ONT
2 stops43h 24m
Qatar Airways
Deal found 7/15$1,464

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 July 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,200
(oojo)

One-way from

$645
(United)

Popular in

January

Cheapest in

October

Average price

$1,028
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. 8% potential increase in price ($108 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 18, 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

Thu 8/6

9:11 am-10:35 pm

2 stops44h 54m

Adelaide

Thu 8/20

8:00 pm-10:10 pm

2 stops42h 40m

$1,200

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 11/1

6:36 pm-2:10 pm

2 stops25h 04m

Adelaide

Sun 11/15

6:10 am-12:01 pm

2 stops24h 21m

$1,281

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 9/1

1:56 pm-10:55 am

2 stops28h 29m

Adelaide

Wed 9/30

6:00 am-10:23 am

2 stops20h 53m

$1,287

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 11/14

4:04 pm-4:20 pm

2 stops29h 46m

Adelaide

Wed 11/18

6:10 am-12:01 pm

2 stops24h 21m

$1,327

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 11/1

6:36 pm-2:10 pm

2 stops25h 04m

Adelaide

Sat 11/21

6:10 am-12:01 pm

2 stops24h 21m

$1,331

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 8/30

7:59 pm-10:35 pm

3 stops34h 06m

Adelaide

Sun 9/6

3:00 pm-10:10 pm

2 stops23h 40m

$1,413

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 11/1

6:00 am-4:30 pm

2 stops40h 00m

Adelaide

Thu 11/12

10:00 pm-11:18 am

2 stops55h 48m

$1,471

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 11/1

6:00 am-4:30 pm

2 stops40h 00m

Adelaide

Sat 11/14

10:00 pm-6:28 pm

2 stops38h 58m

$1,504
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 10/2

6:32 pm-12:55 pm

2 stops25h 53m

Adelaide

Sat 10/10

6:00 am-10:23 am

2 stops21h 53m

$1,651
Cheapest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 8/3

1:49 pm-11:10 am

2 stops28h 51m

$653

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/14

Showing 1-10 of 20 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 25h 04m. United Airlines provides one of the quickest options available for as low as $1,281. 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

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