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$670+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
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 27, 2026.

This United Airlines deal was found by Cheapflights users on 7/23. 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 8/317:13 pm
ONT
-
ADL
2 stops23h 22m
United Airlines
Wed 9/306:00 am
ADL
-
ONT
2 stops20h 53m
United Airlines
Deal found 7/23$1,212
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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.
Wed 8/199:31 am
ONT
-
ADL
2 stops57h 54m
Multiple Airlines
Sun 8/2311:50 am
ADL
-
ONT
2 stops26h 50m
Multiple Airlines
Deal found 7/26$1,238
This United Airlines deal was found by Cheapflights users on 7/26. 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 9/56:05 am
ADL
-
ONT
2 stops26h 06m
United Airlines
Deal found 7/26$1,258
This United Airlines deal was found by Cheapflights users on 7/25. 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 8/137:13 pm
ONT
-
ADL
2 stops26h 02m
United Airlines
Tue 8/186:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 7/25$1,261
This United Airlines deal was found by Cheapflights users on 7/22. 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 11/304:04 pm
ONT
-
ADL
2 stops29h 46m
United Airlines
Wed 12/97:15 am
ADL
-
ONT
2 stops23h 35m
United Airlines
Deal found 7/22$1,270
This United Airlines deal was found by Cheapflights users on 7/25. 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 10/11:52 pm
ONT
-
ADL
2 stops28h 33m
United Airlines
Thu 10/157:40 am
ADL
-
ONT
2 stops22h 08m
United Airlines
Deal found 7/25$1,525
This oojo deal was found by Cheapflights users on 7/26. 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 10/17:59 pm
ONT
-
ADL
2 stops50h 31m
Qatar Airways
Sat 10/1710:00 pm
ADL
-
ONT
2 stops43h 12m
Qatar Airways
Deal found 7/26$1,643
This United Airlines deal was found by Cheapflights users on 7/26. 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 11/181:35 pm
ONT
-
ADL
2 stops28h 55m
United Airlines
Sun 11/298:40 am
ADL
-
ONT
2 stops22h 19m
United Airlines
Deal found 7/26$1,654
This United Airlines deal was found by Cheapflights users on 7/26. 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 10/11:52 pm
ONT
-
ADL
2 stops28h 33m
United Airlines
Sat 10/176:05 am
ADL
-
ONT
2 stops29h 11m
United Airlines
Deal found 7/26$1,785
This United Airlines deal was found by Cheapflights users on 7/26. 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 12/1711:20 am
ONT
-
ADL
1 stop27h 40m
United Airlines
Wed 1/62:55 pm
ADL
-
ONT
1 stop19h 02m
United Airlines
Deal found 7/26$2,993

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 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,212
(United Airlines)

One-way from

$670
(United Airlines)

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 ($107 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 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 27, 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

Wed 8/19

9:31 am-11:55 am

2 stops57h 54m

Adelaide

Sun 8/23

11:50 am-10:10 pm

2 stops26h 50m

$1,238

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 8/16

7:13 pm-11:10 am

2 stops23h 27m

Adelaide

Sat 9/5

6:05 am-3:41 pm

2 stops26h 06m

$1,258

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 11/30

4:04 pm-4:20 pm

2 stops29h 46m

Adelaide

Wed 12/9

7:15 am-12:20 pm

2 stops23h 35m

$1,270

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

7:59 pm-3:00 pm

2 stops50h 31m

Adelaide

Sat 10/17

10:00 pm-11:42 pm

2 stops43h 12m

$1,643

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 11/18

1:35 pm-1:00 pm

2 stops28h 55m

Adelaide

Sun 11/29

8:40 am-12:29 pm

2 stops22h 19m

$1,654

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

1:52 pm-10:55 am

2 stops28h 33m

Adelaide

Sat 10/17

6:05 am-5:46 pm

2 stops29h 11m

$1,785

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 1/18

7:16 am-5:05 pm

2 stops39h 19m

Adelaide

Wed 1/27

10:00 pm-6:45 pm

2 stops39h 15m

$2,114
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 12/17

11:20 am-9:30 am

1 stop27h 40m

Adelaide

Wed 1/6

2:55 pm-3:27 pm

1 stop19h 02m

$2,993

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 10/20

1:52 pm-11:50 am

2 stops28h 28m

Adelaide

Tue 11/10

8:40 am-12:29 pm

2 stops22h 19m

$6,633

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 10/21

11:13 am-4:00 pm

2 stops35h 17m

Adelaide

Sun 11/8

10:00 pm-6:28 pm

2 stops38h 58m

$7,807

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

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 22m. United Airlines provides one of the quickest options available for as low as $1,212. The distance from Ontario to Adelaide is about 8211 mi. This flight may include one or multiple stops.

  • 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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