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$651+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Jul 20 — Jul 271
Mon 7/20
Mon 7/27
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 June 20, 2026.

This United Airlines deal was found by Cheapflights users on 6/19. 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.
Sun 12/66:53 pm
ONT
-
ADL
2 stops24h 47m
United Airlines
Wed 12/302:55 pm
ADL
-
ONT
1 stop21h 22m
United Airlines
Deal found 6/19$1,279
This United Airlines deal was found by Cheapflights users on 6/20. 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.
Wed 11/114:04 pm
ONT
-
ADL
2 stops26h 26m
United Airlines
Mon 11/238:40 am
ADL
-
ONT
2 stops21h 51m
United Airlines
Deal found 6/20$1,286
This United Airlines deal was found by Cheapflights users on 6/19. 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.
Mon 8/36:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Mon 8/107:15 am
ADL
-
ONT
2 stops21h 27m
United Airlines
Deal found 6/19$1,287
This United Airlines deal was found by Cheapflights users on 6/15. 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.
Tue 11/34:03 pm
ONT
-
ADL
2 stops27h 22m
United Airlines
Tue 11/178:40 am
ADL
-
ONT
2 stops25h 17m
United Airlines
Deal found 6/15$1,293
This United Airlines deal was found by Cheapflights users on 6/18. 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 8/181:56 pm
ONT
-
ADL
2 stops28h 39m
United Airlines
Sat 8/224:30 pm
ADL
-
ONT
2 stops44h 10m
United Airlines
Deal found 6/18$1,294
This Alaska Airlines deal was found by Cheapflights users on 6/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:11 am
ONT
-
ADL
2 stops57h 24m
Multiple Airlines
Wed 8/197:10 pm
ADL
-
ONT
2 stops43h 30m
Multiple Airlines
Deal found 6/17$1,315
This United Airlines deal was found by Cheapflights users on 6/19. 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.
Fri 12/41:33 pm
ONT
-
ADL
2 stops29h 52m
United Airlines
Wed 12/302:55 pm
ADL
-
ONT
1 stop21h 22m
United Airlines
Deal found 6/19$1,336
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Thu 7/26:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Wed 7/156:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 6/18$1,337
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Sun 8/167:13 pm
ONT
-
ADL
2 stops23h 27m
United Airlines
Sat 8/226:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 6/18$1,340
This United Airlines deal was found by Cheapflights users on 6/19. 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.
Fri 7/36:39 pm
ONT
-
ADL
2 stops23h 46m
United Airlines
Tue 7/146:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 6/19$1,344
This United Airlines deal was found by Cheapflights users on 6/15. 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 7/26:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Sat 7/186:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 6/15$1,386
This United Airlines deal was found by Cheapflights users on 6/20. 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.
Thu 7/26:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Thu 7/96:00 am
ADL
-
ONT
2 stops22h 42m
United Airlines
Deal found 6/20$1,393

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 June 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,279
(United Airlines)

One-way from

$651
(KAYAK)

Popular in

January

Cheapest in

October

Average price

$1,497
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 ($110 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 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
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 12/6

6:53 pm-2:10 pm

2 stops24h 47m

Adelaide

Wed 12/30

2:55 pm-5:47 pm

1 stop21h 22m

$1,279

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 11/11

4:04 pm-1:00 pm

2 stops26h 26m

Adelaide

Mon 11/23

8:40 am-12:01 pm

2 stops21h 51m

$1,286

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 11/3

4:03 pm-1:55 pm

2 stops27h 22m

Adelaide

Tue 11/17

8:40 am-3:27 pm

2 stops25h 17m

$1,293

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 8/18

1:56 pm-11:05 am

2 stops28h 39m

Adelaide

Sat 8/22

4:30 pm-8:10 pm

2 stops44h 10m

$1,294

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 8/13

9:11 am-11:05 am

2 stops57h 24m

Adelaide

Wed 8/19

7:10 pm-10:10 pm

2 stops43h 30m

$1,315

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 12/4

1:33 pm-1:55 pm

2 stops29h 52m

Adelaide

Wed 12/30

2:55 pm-5:47 pm

1 stop21h 22m

$1,336

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 7/5

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Thu 7/16

6:05 am-12:12 pm

2 stops22h 37m

$1,337

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 8/8

4:20 pm-11:05 am

2 stops26h 15m

Adelaide

Sun 8/23

6:05 am-12:12 pm

2 stops22h 37m

$1,337

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 7/3

6:39 pm-10:55 am

2 stops23h 46m

Adelaide

Tue 7/14

6:05 am-12:12 pm

2 stops22h 37m

$1,344

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 7/2

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Sat 7/18

6:05 am-12:12 pm

2 stops22h 37m

$1,386

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/15

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3
  • 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 24h 47m. United Airlines provides one of the quickest options available for as low as $1,279. 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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