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$709+ 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 8/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Apr 27 — May 41
Mon 4/27
Mon 5/4
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 March 28, 2026.

This United Airlines deal was found by Cheapflights users on 3/23. 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 4/276:49 pm
ONT
-
ADL
2 stops26h 26m
United Airlines
Mon 5/186:40 am
ADL
-
ONT
2 stops22h 12m
United Airlines
Deal found 3/23$1,567
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Tue 5/56:59 pm
ONT
-
ADL
2 stops23h 36m
United Airlines
Wed 5/136:00 am
ADL
-
ONT
2 stops20h 11m
United Airlines
Deal found 3/25$1,572
This United Airlines deal was found by Cheapflights users on 3/26. 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.
Tue 6/26:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Thu 7/26:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 3/26$1,615
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/156:59 pm
ONT
-
ADL
2 stops23h 36m
United Airlines
Sat 5/236:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 3/27$1,665
This United Airlines deal was found by Cheapflights users on 3/27. 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 9/17:13 pm
ONT
-
ADL
2 stops23h 22m
United Airlines
Tue 9/86:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 3/27$1,825
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Wed 11/186:53 pm
ONT
-
ADL
2 stops23h 37m
United Airlines
Mon 11/306:10 am
ADL
-
ONT
2 stops24h 40m
United Airlines
Deal found 3/25$1,828
This United Airlines deal was found by Cheapflights users on 3/24. 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 11/56:53 pm
ONT
-
ADL
2 stops24h 47m
United Airlines
Tue 11/178:40 am
ADL
-
ONT
2 stops22h 10m
United Airlines
Deal found 3/24$1,851
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Wed 10/216:53 pm
ONT
-
ADL
2 stops23h 27m
United Airlines
Sat 10/318:40 am
ADL
-
ONT
2 stops21h 10m
United Airlines
Deal found 3/25$1,857
This United Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 10/311:33 pm
ONT
-
ADL
2 stops29h 57m
United Airlines
Wed 11/48:40 am
ADL
-
ONT
2 stops22h 10m
United Airlines
Deal found 3/26$1,875
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Sat 10/246:53 pm
ONT
-
ADL
2 stops24h 37m
United Airlines
Wed 10/288:40 am
ADL
-
ONT
2 stops26h 37m
United Airlines
Deal found 3/23$1,877

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 March 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,567
(United Airlines)

One-way from

$709
(Alaska Airlines)

Popular in

January

Cheapest in

May

Average price

$1,122
Provider with most accurate pricing for Los Angeles-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-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. 12% potential increase in price ($162 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 28, 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

Mon 4/27

6:49 pm-1:45 pm

2 stops26h 26m

Adelaide

Mon 5/18

6:40 am-12:22 pm

2 stops22h 12m

$1,567
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 5/5

6:59 pm-11:05 am

2 stops23h 36m

Adelaide

Wed 5/13

6:00 am-9:41 am

2 stops20h 11m

$1,572

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 5/15

6:59 pm-11:05 am

2 stops23h 36m

Adelaide

Sat 5/23

6:05 am-12:12 pm

2 stops22h 37m

$1,665

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 9/1

7:13 pm-11:05 am

2 stops23h 22m

Adelaide

Tue 9/8

6:05 am-12:12 pm

2 stops22h 37m

$1,825

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 7/16

9:11 am-10:35 pm

2 stops44h 54m

Adelaide

Sun 8/2

8:50 am-9:47 pm

2 stops29h 27m

$1,999

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 7/15

12:02 pm-3:50 pm

2 stops35h 18m

Adelaide

Sun 8/2

9:40 pm-8:31 pm

2 stops39h 21m

$3,027

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 7/5

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Sat 7/11

6:05 am-12:12 pm

2 stops22h 37m

$10,574

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 4/27

6:49 pm-1:45 pm

2 stops26h 26m

Adelaide

Sat 5/2

6:05 am-12:22 pm

2 stops22h 47m

$14,105
Cheapest one-way
Quickest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 8/28

8:00 am-10:35 pm

2 stops22h 05m

$709

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 8/29

8:00 am-6:25 pm

2 stops41h 55m

$709

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/28

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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, February is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $681). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,115). 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 26h 26m. United Airlines provides one of the quickest options available for as low as $1,567. 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, February is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $681). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,115). 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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