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$1,493+ Cheap flights from Ontario (ONT) to Adelaide (ADL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Mar 26 — Apr 21
Thu 3/26
Thu 4/2
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 February 24, 2026.

This United Airlines deal was found by Cheapflights users on 2/24. 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.
Sun 10/116:53 pm
ONT
-
ADL
2 stops25h 22m
United Airlines
Mon 10/268:40 am
ADL
-
ONT
2 stops21h 10m
United Airlines
Deal found 2/24$1,493
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Sun 10/111:33 pm
ONT
-
ADL
2 stops30h 42m
United Airlines
Tue 10/276:10 am
ADL
-
ONT
2 stops23h 40m
United Airlines
Deal found 2/24$1,496
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Sun 10/116:53 pm
ONT
-
ADL
2 stops25h 22m
United Airlines
Sat 10/318:40 am
ADL
-
ONT
2 stops26h 37m
United Airlines
Deal found 2/24$1,534
This United Airlines deal was found by Cheapflights users on 2/24. 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 10/156:53 pm
ONT
-
ADL
2 stops23h 47m
United Airlines
Wed 10/286:10 am
ADL
-
ONT
2 stops23h 40m
United Airlines
Deal found 2/24$1,537
This United Airlines deal was found by Cheapflights users on 2/24. 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 2/261:40 pm
ONT
-
ADL
1 stop25h 20m
United Airlines
Sat 3/142:15 pm
ADL
-
ONT
1 stop20h 53m
United Airlines
Deal found 2/24$1,540
This United Airlines deal was found by Cheapflights users on 2/24. 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 10/156:53 pm
ONT
-
ADL
2 stops23h 47m
United Airlines
Fri 10/308:40 am
ADL
-
ONT
2 stops26h 37m
United Airlines
Deal found 2/24$1,577
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Tue 9/156:53 pm
ONT
-
ADL
2 stops23h 42m
United Airlines
Fri 9/256:00 am
ADL
-
ONT
2 stops22h 50m
United Airlines
Deal found 2/22$1,596
This United Airlines deal was found by Cheapflights users on 2/23. 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.
Wed 2/251:45 pm
ONT
-
ADL
2 stops49h 15m
United Airlines
Wed 3/42:55 pm
ADL
-
ONT
1 stop21h 16m
United Airlines
Deal found 2/23$1,633
This United Airlines deal was found by Cheapflights users on 2/20. 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 2/221:50 pm
ONT
-
ADL
2 stops29h 50m
United Airlines
Thu 2/266:10 am
ADL
-
ONT
2 stops24h 58m
United Airlines
Deal found 2/20$1,642

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 February 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$3,048
(United Airlines)

Popular in

January

Cheapest in

May

Average price

$1,064
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
Highest demand for flights based on searches. 13% potential increase in price ($181 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 24, 2026.
Use the filters below to find and compare flights from Ontario to Adelaide that are best for you.

Fly from

Ontario

Fly to

Adelaide

Route

Depart

Return

Price

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 3/9

6:37 pm-9:20 am

1 stop21h 13m

Adelaide

Wed 3/18

2:15 pm-5:41 pm

1 stop20h 56m

$3,048

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 3/9

6:37 pm-9:20 am

1 stop21h 13m

Adelaide

Sat 3/21

2:15 pm-5:38 pm

1 stop20h 53m

$3,098

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 3/12

6:37 pm-9:20 am

1 stop21h 13m

Adelaide

Wed 3/18

2:15 pm-5:41 pm

1 stop20h 56m

$3,098

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 3/12

6:37 pm-9:20 am

1 stop21h 13m

Adelaide

Sat 3/21

2:15 pm-10:57 pm

1 stop26h 12m

$3,148

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 6/20

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Thu 11/12

8:40 am-12:20 pm

2 stops22h 10m

$7,969

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 4/1

8:32 am-10:35 pm

2 stops44h 33m

$5,110

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

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 $700). 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 21h 13m. United Airlines provides one of the quickest options available for as low as $3,048. 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 $700). 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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